Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad80767a39108c95…

MALICIOUS

PDF

72.1 KB Created: 2021-01-08 17:19:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 58bb3e6246803917c85664aafb961e19 SHA-1: da0703158d659eeff73bdd5e834cce3502e04e1a SHA-256: ad80767a39108c9591ad7fc9df706fdd4943c5c2a04c2ee7f20471a8754a2eaa
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for PDF_SEO_LINK_FARM, indicating a large number of external links. One of these links, 'https://trafftec.ru/aws?utm_term=trading+account+format+pdf', is directly embedded and points to a suspicious domain. The ML classifier and ClamAV also flagged this PDF as malicious, suggesting a phishing or trojanized document. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafftec.ru/aws?utm_term=trading+account+format+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4372955/normal_5faa1177ccf41.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414339/normal_5ff3e82d68ab2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471109/normal_5fa3a73913f19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367947/normal_5f905b18f37cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413469/normal_5f9c7aa53cfaf.pdfIn PDF document text
    • https://cdn.sqhk.co/reretukida/XidgdF3/89543891716.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403806/normal_5fbe89fbc4c2c.pdfIn PDF document text
    • https://lilikegemuvil.weebly.com/uploads/1/3/1/3/131398424/xiluputajivu.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxuvedije/4jihegd/73927478216.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/fotojipifuzitul/eagle_eye_headlights_taiwan.pdfIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/chiko_roll_nutritional_information.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b35e2641-ab11-4a73-986c-64b28c95fcb2/trx_printable_workout.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42dd2de7-300c-4ce6-ab6c-9ba9d7e3e780/nordictrack_treadmill_repair_parts.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_off0000dd6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6D 5216 bytes
SHA-256: 9539f697b231edb8eeb4602031414789c329cfa6223d4f77636c604f21588aaa
font_01_sfnt_off0000ef20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF20 11080 bytes
SHA-256: af68988c708b258681079697f388a4dc184746aa84a7d78d748b45365aaa2a50

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