Malicious PDF — malware analysis report

Static analysis result for SHA-256 55acdce49b632e42…

MALICIOUS

PDF

42.1 KB Created: 2020-11-08 02:10:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 304e36ae35dd05c21bf14bfaa4afd2b1 SHA-1: 830a62725f356a6221e2af4e8a90250a1d7af03e SHA-256: 55acdce49b632e42b2c31b992b32aa7ebcdff1d6aa3df8113b0235f6627e51a6
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1534 Credentials from Password Stores T1059.007 JavaScript

The sample is a PDF document identified as a credential phishing lure impersonating Yahoo. It contains an embedded URL that redirects to a malicious domain, which in turn points to a PDF file hosted on weebly.com, likely a fake login page. The ML classifier strongly indicated maliciousness, and the specific heuristic for brand-based credential phishing confirms the intent to harvest user credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://sazojowob.weebly.com/uploads/1/3/4/3/134351878/51e5f0b960b8.pdf.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://trafficel.ru/123?keyword=yahoo+mail+login+password+reset+on+iphone PDF link annotation
    • https://sazojowob.weebly.com/uploads/1/3/4/3/134351878/51e5f0b960b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366055/normal_5f875acf6efb1.pdfIn PDF document text
    • https://dunefofitibo.weebly.com/uploads/1/3/4/6/134608320/9521847.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/febopa/zwiebels_auto_pinebluff_nc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/297f92bd-b84d-44a4-9669-5fac90b56c0f/rinaxejugubodelewewem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22edb5a2-a378-4e5a-93c3-4d9f8640928e/dexovidaxivubopilov.pdfIn PDF document text
    • https://rolotoba.files.wordpress.com/2020/11/34626921492.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8974c528-3ded-4ddf-a996-85522d0595e2/howard_high_school_macon_georgia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34ad13ee-894c-4f7d-a68a-8d24a63b9347/5909147887.pdfIn PDF document text
    • https://s3.amazonaws.com/vexeliku/gunblood_2_cheats_unblocked.pdfIn PDF document text
    • https://dagirivemaj.files.wordpress.com/2020/11/13670929565.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/apowersoft_online_editor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae12a136-171e-472a-9b99-e805ba14c562/xubeb.pdfIn PDF document text
    • https://s3.amazonaws.com/salade/62008339290.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/644d9104-45eb-4513-be16-ca4bdce228a2/vipobi.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64A8 5428 bytes
SHA-256: 3a435c78669b0099033551db195a36f0eeff080d39491d130582d956a204835e
font_01_sfnt_off00007703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7703 10612 bytes
SHA-256: f1543b6b5c191d19ea4fe2f31f7f018040f88c5d9e1120783151c23805c7e39d

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