Exhibit 1.2

Execution Copy

GUARANTY

THIS GUARANTY, dated as of November 20, 2012 (as amended, supplemented, or otherwise modified from time to time, this “Guaranty”), made by PENNYMAC MORTGAGE INVESTMENT TRUST, a Maryland investment trust (together with its successors and permitted assigns, the “Guarantor”) in favor of MORGAN STANLEY BANK, N.A. (the “Buyer”), party to the Master Repurchase Agreement, dated as of the date hereof, by and among the Buyer, PENNYMAC CORP. (the “Seller”), and MORGAN STANLEY MORTGAGE CAPITAL HOLDINGS LLC, as agent for the Buyer (as amended from time to time, the “Repurchase Agreement”).

RECITALS

Reference is made to the Repurchase Agreement, pursuant to which the Buyer agreed to enter into transactions with the Seller upon the terms and subject to the conditions set forth therein.  It is a condition precedent to the obligation of the Buyer to enter into Transactions with the Seller under the Repurchase Agreement, that the Guarantor execute and deliver to the Buyer this Guaranty.  The Guarantor is receiving a benefit either directly or indirectly from the Seller for entering into this the Repurchase Agreement.  The Guarantor is an indirect owner of Seller.

Now, therefore, in consideration of the premises and to induce the Buyer to enter into the Repurchase Agreement and engage in Transactions with the Seller, and for other good and valuable consideration the receipt and sufficiency of which is hereby acknowledged, the Guarantor hereby agrees to guarantee the Seller’s obligations under the Repurchase Agreement, as may be amended from time to time.

1.                                      Defined Terms.

(a)                                 Unless otherwise defined herein, terms defined in the Repurchase Agreement and used herein shall have the meanings given to them in the Repurchase Agreement.

(b)                                 For purposes of this Guaranty, “Obligations” shall mean all obligations and liabilities of the Seller to the Buyer, whether direct or indirect, absolute or contingent, due or to become due, or now existing or hereafter incurred, or whether for payment or for performance (including, without limitation, Price Differential accruing after the Repurchase Date for the Transactions and Price Differential accruing after the filing of any petition in bankruptcy, or the commencement of any insolvency, reorganization or like proceeding, relating to the Seller, whether or not a claim for post filing or post petition interest is allowed in such proceeding), in any case which may arise under, or out of or in connection with the Repurchase Agreement, this Guaranty and any other Repurchase Documents and any other document made, delivered or given in connection therewith or herewith, whether on account of principal, interest, reimbursement obligations, fees, indemnities, costs, expenses (including, without limitation, all fees and disbursements of counsel to the Buyer that are required to be paid by the Seller pursuant to the terms of such documents), all “claims” (as defined in Section 101 of the Bankruptcy Code) of the Buyer against the Seller, or otherwise.

(c)                                  The words “hereof,” “herein” and “hereunder” and words of similar import when used in this Guaranty shall refer to this Guaranty as a whole and not to any particular provision of this Guaranty, and section and paragraph references are to this Guaranty unless otherwise specified.

(d)                                 The meanings given to terms defined herein shall be equally applicable to both the singular and plural forms of such terms.

2.                                      Guaranty.

(a)                                 The Guarantor hereby, unconditionally and irrevocably, jointly and severally guarantees to the Buyer and its successors, indorsees, transferees and assigns, the prompt and complete payment and performance by the Seller when due (whether at the stated maturity, by acceleration or otherwise) of the Obligations.

(b)                                 The Guarantor further agrees to pay any and all expenses (including, without limitation, all fees and disbursements of counsel) which may be paid or incurred by the Buyer in enforcing, or obtaining advice of counsel in respect of, any rights with respect to, or collecting, any or all of the Obligations and/or enforcing any rights with respect to, or collecting against, the Guarantor under this Guaranty.

(c)                                  No payment or payments made by the Seller, the Guarantor, any other guarantor or any other Person or received or collected by the Buyer from the Seller, the Guarantor, any other guarantor or any other Person by virtue of any action or proceeding or any set-off or appropriation or application at any time or from time to time in reduction of or in payment of the Obligations shall be deemed to modify, reduce, release or otherwise affect the liability of the Guarantor hereunder which shall, notwithstanding any such payment or payments other than payments made by the Guarantor in respect of the Obligations or payments received or collected from the Guarantor in respect of the Obligations, remain liable for the Obligations up to the maximum liability of the Guarantor hereunder until the Obligations are paid in full and the Repurchase Agreement is terminated subject to the provisions of Section 7 hereof.

(d)                                 The Guarantor agrees that whenever, at any time, or from time to time, it shall make any payment to the Buyer on account of the Guarantor’s liability hereunder, it will notify the Buyer in writing that such payment is made under this Guaranty for such purpose.

3.                                      Right of Set-off.  Upon the occurrence and continuation of any Event of Default, the Guarantor hereby irrevocably authorizes the Buyer at any time and from time to time without notice to the Guarantor, any such notice being expressly waived by the Guarantor, to set-off and appropriate and apply any and all monies and other property of the Guarantor, deposits (general or special, time or demand, provisional or final), in any currency, and any other credits, indebtedness or claims, in any currency, in each case whether direct or indirect, absolute or contingent, matured or unmatured, at any time held or owing by the Buyer or any Affiliate thereof to or for the credit or the account of the Guarantor, or any part thereof in such amounts as the Buyer may elect, against and on account of the Obligations and liabilities of the Guarantor to the Buyer hereunder and claims of every nature and description of the Buyer against the Guarantor, in any currency, whether arising hereunder, under the Repurchase Agreement, any

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promissory note, or otherwise, as the Buyer may elect, whether or not the Buyer has made any demand for payment and although such Obligations, liabilities and claims may be contingent or unmatured.  The Buyer shall notify the Guarantor promptly of any such set-off and the application made by the Buyer; provided that the failure to give such notice shall not affect the validity of such set-off and application.  The rights of the Buyer under this Section are in addition to other rights and remedies (including, without limitation, other rights of set-off) which the Buyer may have.

4.                                      No Subrogation.  Notwithstanding any payment or payments made by the Guarantor hereunder or any set-off or application of funds of the Guarantor by the Buyer, the Guarantor shall not be entitled to be subrogated to any of the rights of the Buyer against the Seller or any other guarantor or any collateral security or guarantee or right of offset held by the Buyer for the payment of the Obligations, nor shall the Guarantor seek or be entitled to seek any contribution or reimbursement from the Seller or any other guarantor in respect of payments made by the Guarantor hereunder, until all amounts owing to the Buyer by the Seller on account of the Obligations are paid in full and the Repurchase Agreement is terminated.  The Guarantor hereby subordinates all of its subrogation rights against the Seller to the full payment of Obligations due to the Buyer under the Repurchase Agreement for a period of one year and one day following the final payment of the last of all of the Obligations under the Repurchase Documents.  If any amount shall be paid to the Guarantor on account of such subrogation rights at any time when all of the Obligations shall not have been paid in full, such amount shall be held by the Guarantor in trust for the Buyer, segregated from other funds of the Guarantor, and shall, forthwith upon receipt by the Guarantor, be turned over to the Buyer in the exact form received by the Guarantor (duly indorsed by the Guarantor to the Buyer, if required), to be applied against the Obligations, whether matured or unmatured, in such order as the Buyer may determine.

5.                                      Amendments, Etc. with Respect to the Obligations; Waiver of Rights.  The Guarantor shall remain obligated hereunder notwithstanding that, without any reservation of rights against such Guarantor and without notice to or further assent by the Guarantor, any demand for payment of any of the Obligations made by the Buyer may be rescinded by the Buyer and any of the Obligations continued, and the Obligations, or the liability of any other party upon or for any part thereof, or any collateral security or guarantee therefor or right of offset with respect thereto, may, from time to time, in whole or in part, be renewed, extended, amended, modified, accelerated, compromised, waived, surrendered or released by the Buyer, and the Repurchase Agreement, and the other Repurchase Documents and any other documents executed and delivered in connection therewith may be amended, modified, supplemented or terminated, in whole or in part, as the Buyer may deem advisable from time to time, and any collateral security, guarantee or right of offset at any time held by the Buyer for the payment of the Obligations may be sold, exchanged, waived, surrendered or released.  The Buyer shall not have any obligation to protect, secure, perfect or insure any lien at any time held by it as security for the Obligations or for this Guaranty or any property subject thereto.  When making any demand hereunder against the Guarantor, the Buyer may, but shall be under no obligation to, make a similar demand on the Seller or any other guarantor, and any failure by the Buyer to make any such demand or to collect any payments from the Seller or any such other guarantor or any release of the Seller or such other guarantor shall not relieve the Guarantor of its obligations or liabilities hereunder, and shall not impair or affect the rights and remedies, express or implied,

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or as a matter of law, of the Buyer against the Guarantor.  For the purposes hereof “demand” shall include the commencement and continuance of any legal proceedings.

6.                                      Guaranty Absolute and Unconditional.

(a)                                 The Guarantor waives any and all notice of the creation, renewal, extension or accrual of any of the Obligations and notice of or proof of reliance by the Buyer upon this Guaranty or acceptance of this Guaranty, the Obligations, and any of them, shall conclusively be deemed to have been created, contracted or incurred, or renewed, extended, amended or waived, in reliance upon this Guaranty; and all dealings between the Seller and the Guarantor, on the one hand, and the Buyer, on the other hand, likewise shall be conclusively presumed to have been had or consummated in reliance upon this Guaranty.

(b)                                 The Guarantor hereby expressly waives all set-offs and counterclaims and all diligence, presentments, demands for payment, demands for performance, notices of nonperformance, protests, notices of protest, notices of dishonor, notices of acceptance of this Guaranty, notices of sale, notice of default or nonpayment to or upon the Seller or the Guarantor, surrender or other handling or disposition of assets subject to the Repurchase Agreement, any requirement that the Buyer exhaust any right, power or remedy or take any action against the Seller or against any assets subject to the Repurchase Agreement, and other formalities of any kind.

(c)                                  The Guarantor understands and agrees that this Guaranty shall be construed as a continuing, absolute and unconditional guarantee of payment of the Obligations without regard to (i) the validity, regularity or enforceability of the Repurchase Agreement (or the lack of authority of Seller to execute or deliver the Repurchase Agreement), any of the Obligations or any other collateral security therefor or guarantee or right of offset with respect thereto at any time or from time to time held by the Buyer, (ii) any defense, set-off or counterclaim (other than a defense of payment or performance) which may at any time be available to or be asserted by the Seller against the Buyer, or (iii) any other circumstance whatsoever (with or without notice to or knowledge of the Seller or the Guarantor) which constitutes, or might be construed to constitute, an equitable or legal discharge of the Seller from the Obligations, or of the Guarantor from this Guaranty, in bankruptcy or in any other instance.

(d)                                 When pursuing its rights and remedies hereunder against the Guarantor, the Buyer may, but shall be under no obligation to, pursue such rights and remedies as it may have against the Seller or any other Person or against any collateral security or guarantee for the Obligations or any right of offset with respect thereto, and any failure by the Buyer to pursue such other rights or remedies or to collect any payments from the Seller or any such other Person or to realize upon any such collateral security or guarantee or to exercise any such right of offset, or any release of the Seller or any such other Person or any such collateral security, guarantee or right of offset, shall not relieve the Guarantor of any liability hereunder, and shall not impair or affect the rights and remedies, whether express, implied or available as a matter of law, of the Buyer against the Guarantor.

(e)                                  This Guaranty shall remain in full force and effect and be binding in accordance with and to the extent of its terms upon the Guarantor and the successors and assigns

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thereof, and shall inure to the benefit of the Buyer, and its successors, indorsees, transferees and assigns, until all the Obligations and the obligations of the Guarantor under this Guaranty shall have been satisfied by payment in full and the Repurchase Agreement shall be terminated, notwithstanding that from time to time prior thereto the Seller may be free from any Obligations.

(f)                                   The Guarantor waives, to the fullest extent permitted by applicable law, all defenses of surety to which it may be entitled by statute or otherwise.

7.                                      Reinstatement.  The Obligations of the Guarantor under this Guaranty, and this Guaranty shall continue to be effective, or be reinstated, as the case may be, and be continued in full force and effect, if at any time any payment, or any part thereof, of any of the Obligations is rescinded, invalidated, declared fraudulent or preferentially set aside or must otherwise be restored, returned or repaid by the Buyer upon the insolvency, bankruptcy, dissolution, liquidation or reorganization of the Seller or the Guarantor, or upon or as a result of the appointment of a receiver, intervenor or conservator of, or trustee or similar officer for, the Seller or the Guarantor or any substantial part of its or their property, or for any other reason, all as though such payments had not been made.

8.                                      Payments.  The Guarantor hereby guarantees that payments hereunder will be paid to the Buyer without set-off or counterclaim in U.S. Dollars.

9.                                      Event of Default.  If a Default or an Event of Default under the Repurchase Agreement shall have occurred and be continuing, the Guarantor agrees that, as between the Guarantor and Buyer, the Obligations may be declared to be due for purposes of this Guaranty notwithstanding any stay, injunction or other prohibition which may prevent, delay or vitiate any such declaration as against Seller and that, in the event of any such declaration (or attempted declaration), such Obligations shall forthwith become due by the Guarantor for purposes of this Guaranty.

10.                               Representations and Warranties.

(a)                                 The Guarantor represents and warrants that (i) it is duly authorized to execute and deliver this Guaranty, to perform its obligations hereunder and has taken all necessary action to authorize such execution, delivery and performance; (ii) the person signing this Guaranty on its behalf is duly authorized to do so on its behalf; (iii) this Guaranty is a legal, valid and binding obligation of it, enforceable against it in accordance with its terms, subject to applicable bankruptcy, insolvency, or similar debtor/creditor laws and general principles of equity and public policy, (iv) no approval, consent or authorization of this Guaranty from any federal, state, or local regulatory authority having jurisdiction over it is required or, if required, such approval, consent or authorization has been or will be obtained, prior to the initial Transaction; (v) the execution, delivery, and performance of this Guaranty will not violate any law, regulation, order, judgment, decree, ordinance, charter, by law, or rule applicable to it or its property or constitute a default (or an event which, with notice or lapse of time, or both would constitute a default) under or result in a breach of any material agreement or other material instrument by which it is bound or by which any of its assets are affected; (vi) it has received approval and authorization to enter into this Guaranty pursuant to its internal policies and procedures; (vii) this Guaranty is not entered into in contemplation of insolvency or with intent

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to hinder, delay or defraud any creditor, (viii) it has examined and comprehends the Repurchase Agreement in its entirety and (ix) that it has a financial interest in the Seller and it has determined that it will benefit from the execution of the Repurchase Agreement.

(b)                                 The Guarantor represents, warrants and covenants to the Buyer that as of the date of this Guaranty and as of the date of any Transaction under the Repurchase Agreement and at all times while this Guaranty and any Transaction under the Repurchase Agreement are in effect or there are Obligations outstanding:

(i)                                     Performance of Guaranty.  The Guarantor does not believe, nor does it have any reason or cause to believe, that it cannot perform each and every covenant contained in this Guaranty on its part to be performed;

(ii)                                  Guarantor Not Insolvent.  The Guarantor is not, and with the passage of time does not expect to become, insolvent; and

(iii)                               Ownership of Seller.  The Guarantor is now, and will remain, the indirect owner of 100% of the Seller.

(c)                                  The Guarantor covenants and agrees that it shall not consolidate with or merge into, or transfer all or substantially all of its assets to, another entity (or permit the occurrence of same) unless the resulting surviving or transferee entity (a) is a corporation organized under the laws of the United States of America or political subdivision thereof; (b) assumes all the obligations of the Guarantor under this Guaranty pursuant to an agreement reasonably satisfactory to the Buyer or by law; (c) such merger, consolidation or asset transfer has received the prior written approval of the regulatory authorities having jurisdiction over such transaction; and (d) the Buyer receives as part of the aforementioned agreement assurances from such entity prior to the proposed merger, consolidation or asset acquisition, reasonably satisfactory to the Buyer, that such entity would not, following such proposed transaction, present an unacceptable credit risk to the Buyer and would be an entity able to faithfully perform under the terms of this Guaranty.

11.                               Financial Covenants.  The Guarantor covenants and agrees to comply with the covenants in Sections 6 and 7 of the Repurchase Agreement.

12.                               Notices. All notices, requests and other communications provided for herein (including without limitation any modifications of, or waivers, requests or consents under, this Guaranty) shall be given or made in writing (including without limitation by electronic transmission) delivered to the intended recipient at the address specified below its name on the signature page to the Repurchase Agreement or, with respect to Guarantor, at the “Address for Notices” specified below its name on the signature page hereof; or, as to any party, at such other address as shall be designated by such party in a written notice to each other party.  All such communications shall be deemed to have been duly given when transmitted by electronic transmission or personally delivered or, in the case of a mailed notice, upon receipt, in each case given or addressed as aforesaid.

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13.                               Severability. Any provision of this Guaranty which is prohibited or unenforceable in any jurisdiction shall, as to such jurisdiction, be ineffective to the extent of such prohibition or unenforceability without invalidating the remaining provisions hereof, and any such prohibition or unenforceability in any jurisdiction shall not invalidate or render unenforceable such provision in any other jurisdiction.

14.                               Integration.  This Guaranty represents the agreement of the Guarantor with respect to the subject matter hereof and thereof and there are no promises or representations by the Buyer relative to the subject matter hereof or thereof not reflected herein or therein.

15.                               Amendments in Writing; No Waiver; Cumulative Remedies.

(a)                                 None of the terms or provisions of this Guaranty may be waived, amended, supplemented or otherwise modified except by a written instrument executed by the Guarantor and the Buyer; provided that any provision of this Guaranty may be waived by the Buyer.

(b)                                 The Buyer shall not by any act (except by a written instrument pursuant to Section 15(a) hereof) delay, indulgence, or omission be deemed to have waived any right or remedy hereunder or to have acquiesced in any Default, Event of Default or breach of any of the terms and conditions hereof.  No failure to exercise, nor any delay in exercising, on the part of the Buyer, any right, power or privilege hereunder shall operate as a waiver thereof.  No single or partial exercise of any right, power or privilege hereunder shall preclude any other or further exercise thereof or the exercise of any other right, power or privilege.  A waiver by the Buyer of any right or remedy hereunder on any one occasion shall not be construed as a bar to any right or remedy which the Buyer would otherwise have on any future occasion.

(c)                                  The rights and remedies herein provided are cumulative, may be exercised singly or concurrently and are not exclusive of any other rights or remedies provided by law.

16.                               Section Headings.  The section headings used in this Guaranty are for convenience of reference only and are not to affect the construction hereof or be taken into consideration in the interpretation hereof.

17.                               Successors and Assigns.  This Guaranty shall be binding upon the successors and assigns of the Guarantor and shall inure to the benefit of the Buyer and its successors and assigns.  This Guaranty may not be assigned by the Guarantor without the express written consent of the Buyer.

18.                               GOVERNING LAW.  THIS GUARANTY AND ANY CLAIM, CONTROVERSY OR DISPUTE ARISING UNDER OR RELATED TO THIS GUARANTY, THE RELATIONSHIP OF THE PARTIES TO THIS GUARANTY, AND/OR THE INTERPRETATION AND ENFORCEMENT OF THE RIGHTS AND DUTIES OF THE PARTIES TO THIS GUARANTY SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE INTERNAL LAWS AND DECISIONS OF THE STATE OF NEW YORK, WITHOUT REGARD TO THE CHOICE OF LAW RULES THEREOF.  THE PARTIES HERETO INTEND THAT THE PROVISIONS OF

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SECTION 5-1401 OF THE NEW YORK GENERAL OBLIGATIONS LAW SHALL APPLY TO THIS GUARANTY.

19.                               SUBMISSION TO JURISDICTION; WAIVERS. THE GUARANTOR HEREBY IRREVOCABLY AND UNCONDITIONALLY:

(A)                               SUBMITS FOR ITSELF AND ITS PROPERTY IN ANY LEGAL ACTION OR PROCEEDING RELATING TO THIS GUARANTY AND THE OTHER REPURCHASE DOCUMENTS, OR FOR RECOGNITION AND ENFORCEMENT OF ANY JUDGMENT IN RESPECT THEREOF, TO THE NON-EXCLUSIVE GENERAL JURISDICTION OF THE COURTS OF THE STATE OF NEW YORK, THE FEDERAL COURTS OF THE UNITED STATES OF AMERICA FOR THE SOUTHERN DISTRICT OF NEW YORK, AND APPELLATE COURTS FROM ANY THEREOF;

(B)                               CONSENTS THAT ANY SUCH ACTION OR PROCEEDING MAY BE BROUGHT IN SUCH COURTS AND, TO THE EXTENT PERMITTED BY LAW, WAIVES ANY OBJECTION THAT IT MAY NOW OR HEREAFTER HAVE TO THE VENUE OF ANY SUCH ACTION OR PROCEEDING IN ANY SUCH COURT OR THAT SUCH ACTION OR PROCEEDING WAS BROUGHT IN AN INCONVENIENT COURT AND AGREES NOT TO PLEAD OR CLAIM THE SAME;

(C)                               AGREES THAT SERVICE OF PROCESS IN ANY SUCH ACTION OR PROCEEDING MAY BE EFFECTED BY MAILING A COPY THEREOF BY REGISTERED OR CERTIFIED MAIL (OR ANY SUBSTANTIALLY SIMILAR FORM OF MAIL), POSTAGE PREPAID, TO ITS ADDRESS SET FORTH UNDER ITS SIGNATURE BELOW OR AT SUCH OTHER ADDRESS OF WHICH THE BUYER SHALL HAVE BEEN NOTIFIED; AND

(D)                               AGREES THAT NOTHING HEREIN SHALL AFFECT THE RIGHT TO EFFECT SERVICE OF PROCESS IN ANY OTHER MANNER PERMITTED BY LAW OR SHALL LIMIT THE RIGHT TO SUE IN ANY OTHER JURISDICTION.

20.                               WAIVER OF JURY TRIAL. EACH OF THE GUARANTOR AND THE BUYER HEREBY IRREVOCABLY WAIVES, TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, ANY AND ALL RIGHT TO TRIAL BY JURY IN ANY LEGAL PROCEEDING ARISING OUT OF OR RELATING TO THIS GUARANTY, ANY OTHER REPURCHASE DOCUMENT OR THE TRANSACTIONS CONTEMPLATED HEREBY OR THEREBY.

[SIGNATURE PAGE FOLLOWS]

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IN WITNESS WHEREOF, the undersigned have caused this Guaranty to be duly executed and delivered by its duly authorized officer as of the date first above written.