Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b6c3a06bd80298a…

MALICIOUS

PDF

83.8 KB Created: 2020-12-25 22:40:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f4c36d44709adb39b68b571de6c0a223 SHA-1: 789635c9b0b09d39260cff9744d64bfd6d29e692 SHA-256: 6b6c3a06bd80298a548d24853f51ed7c85d6f7e375c0207d43c332bd29da35d0
156 Risk Score

Malware Insights

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

The PDF document contains embedded links and a URL in its body text that point to external websites. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to drive traffic to various sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or a scam, as suggested by the URL containing 'purefit keto cost uk'. No scripts were extracted, but the presence of multiple external links points to a content-driven lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://trafffe.ru/123?utm_term=purefit+keto+cost+uk PDF link annotation
    • https://topizamo.weebly.com/uploads/1/3/4/4/134435864/tematebug.pdfIn PDF document text
    • https://cdn.sqhk.co/xawuboma/5jDlggJ/kisovubomumivet.pdfIn PDF document text
    • https://cdn.sqhk.co/dekaroku/R3YcuTP/zakijajalazivejilo.pdfIn PDF document text
    • https://nuzimalufugi.weebly.com/uploads/1/3/4/7/134705392/6c4a31e50f0.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/pexodugosa/somej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/167dd899-d506-4d22-a22f-92899c2f65a6/32626804619.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cd66ee7-bb6e-4c94-bfb4-7f9913002b4f/wagonud.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/practical_problem-_solving_skills_in_the_workplace.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c71bbb82-b38f-4eec-944c-232eab7c6a4f/zekogolevuwiragukijabiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5848242f-ec29-4d05-ac37-eb352c789580/55_useless_facts_msn.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_off00010b31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B31 4696 bytes
SHA-256: f6f536bca7a5bd06b2bdc2874938fd649aad1eb38902055d6853b3a109db8c70
font_01_sfnt_off00011b42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B42 11556 bytes
SHA-256: 2d25377666662ed2e883238c97b76b0a72dc9649d23795a8a97805ff53f8c69b

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