Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f4597e228e4c167…

MALICIOUS

PDF

147.4 KB Created: 2021-01-25 07:41:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: bc1607a12a2db74aecbc4694272faefa SHA-1: 1a9e855f6af4c176cd9a5c3b8ab933c92601e015 SHA-256: 5f4597e228e4c1678cbf883817afbf36e2923766b95bda71400fe3e394ac0c2c
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically for brand-impersonation credential phishing. It contains embedded URLs that redirect to a phishing page impersonating Apple. The document body, though heavily obfuscated, appears to contain metadata related to its creation, but no direct instructions or lures are readable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fajuvupo.weebly.com/uploads/1/3/5/3/135310445/7867775.pdf.
  • 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://trafffi.ru/123?utm_term=ancient+mesopotamia+politics+and+government PDF link annotation
    • https://fajuvupo.weebly.com/uploads/1/3/5/3/135310445/7867775.pdfIn PDF document text
    • https://gofegupozomo.weebly.com/uploads/1/3/4/4/134479888/gijimapijeboxa.pdfIn PDF document text
    • https://lomowurepiv.weebly.com/uploads/1/3/1/4/131437546/rolisatevoxolid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405185/normal_5fe5ea4d608e2.pdfIn PDF document text
    • https://degugelusejife.weebly.com/uploads/1/3/2/6/132695568/d08f4867.pdfIn PDF document text
    • https://cdn.sqhk.co/bojojiweg/figoYjj/1091669823.pdfIn PDF document text
    • https://lufokojas.weebly.com/uploads/1/3/5/3/135398832/8a535.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490516/normal_5ffb9fe8d1bbe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366395/normal_5ff5ee9e3725b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487935/normal_6008d1f6d02b4.pdfIn PDF document text
    • https://cdn.sqhk.co/rubovadu/iigcziU/xujudutikejiz.pdfIn PDF document text
    • https://zujefimobob.weebly.com/uploads/1/3/1/4/131453463/6889275.pdfIn PDF document text
    • https://kivobuduzuv.weebly.com/uploads/1/3/0/7/130739084/8598a28556.pdfIn PDF document text
    • https://zanolidades.weebly.com/uploads/1/3/2/6/132695759/selatomonazetuwem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jumedemimo/basic_calculus_book_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/muvazi/movokevun.pdfIn PDF document text
    • https://s3.amazonaws.com/dazemi/axioms_and_postulates.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/26128148259.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001f847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F847 5232 bytes
SHA-256: 5be9d2e8a761c4fd9ee4d43561cd232377d286f2173ac0345ed35bf413692df3
font_01_sfnt_off000209f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x209F2 11608 bytes
SHA-256: 01e0a74992a5fd0febaeb49a903f6b56f76cd6d68a57d144e7882328fa7f8513
font_02_sfnt_off00023156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23156 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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