Malicious PDF — malware analysis report

Static analysis result for SHA-256 4268cfdca4af4281…

MALICIOUS

PDF

71.2 KB Created: 2021-03-19 21:35:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: eccc19b640b41a2489318fb6c7094c39 SHA-1: 9c340ea2c0667f72bd595eb8b191b9e12f0f75e4 SHA-256: 4268cfdca4af42815c991572408d6db4ebaaca6cd5bdaa46457dc5a3c466d701
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs pointing to other PDF documents hosted on disposable domains. The primary purpose appears to be directing users to potentially malicious content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://bologen.ru/strik?utm_term=can+you+follow+directions+test+pdf PDF link annotation
    • https://fugunukotuji.weebly.com/uploads/1/3/4/5/134589730/6340246.pdfIn PDF document text
    • http://triple-doska4.club/gm_diet_plan_day_7_menuadz3j.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379855/normal_5ff45495df080.pdfIn PDF document text
    • https://falugasotemo.weebly.com/uploads/1/3/1/4/131410545/3090896.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504922/normal_5fdb322919a17.pdfIn PDF document text
    • https://votozugilom.weebly.com/uploads/1/3/1/0/131071295/3b9e8.pdfIn PDF document text
    • https://zaberiwa.weebly.com/uploads/1/3/4/4/134444812/lefureb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413238/normal_600a976f678f7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407318/normal_5ffe2c579cf13.pdfIn PDF document text
    • https://lexeponin.weebly.com/uploads/1/3/1/8/131856664/669cec3d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409103/normal_5feed089a2a6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367656/normal_6052ae731f44a.pdfIn PDF document text
    • https://sosojenanoxo.weebly.com/uploads/1/3/5/3/135316520/waxosafar_wujuvuropo_degifigamevev.pdfIn PDF document text
    • http://worldworkbook.com/how_to_interview_a_technical_recruiter0dsab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487382/normal_5ff8f6e76a724.pdfIn PDF document text
    • https://wuliwedifa.weebly.com/uploads/1/3/4/7/134753749/mipokalus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://17673d3b-e5d0-4e0e-8211-f079fadf35f5.filesusr.com/ugd/13ae68_7f3c8d8f1aea4f18ade53787ee98322d.pdf?index=trueIn PDF document text
    • https://2ffa788b-df2f-461f-b9c5-573bec542745.filesusr.com/ugd/374ce0_5ddaa2a32ce144a0899f5120ad8de8d8.pdf?index=trueIn PDF document text
    • https://b5c4f4dd-ae1f-4f6a-908c-f463551224e4.filesusr.com/ugd/dafd60_1561304b142240debe3686fd164c2fb2.pdf?index=trueIn PDF document text
    • https://30c0d994-bee2-4d79-bc91-d4aaa7251653.filesusr.com/ugd/0962d9_170977d5cac74d25a03f181dd651aa43.pdf?index=trueIn 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_off0000d7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AC 5248 bytes
SHA-256: 5d472e8bd5abac0c1f2880551caa82cc25a563598749ea88c44aa223fba8f5a4
font_01_sfnt_off0000e9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AE 11116 bytes
SHA-256: 7530b9c7ff9aa7a0432865aa6b21a91ab984c7f7767cb58ec46ac8930d1695c6

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