Malicious PDF — malware analysis report

Static analysis result for SHA-256 366dccf2f9267e9c…

MALICIOUS

PDF

68.8 KB Created: 2020-11-20 10:24:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: fca2c58b99e43d64028f0a21ba12cfa1 SHA-1: 747aecffea41924ca930bc47fa650da93efc938c SHA-256: 366dccf2f9267e9c19dd2f0a9a530a3811b4dd687391a251276d9115707233f4
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. The presence of a 'PDF_SEO_LINK_FARM' heuristic suggests the document is designed to host numerous external links, with one prominent example being 'https://s3.amazonaws.com/gonafoziguwewe/67444492688.pdf'. Another external URI, 'https://trafficel.ru/123?utm_term=island+line+trail+vt', was also extracted. While no scripts were explicitly extracted, the nature of the link farm and the ML classification point towards a phishing or malicious content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/123?utm_term=island+line+trail+vt PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4401723/normal_5f946a9073c53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391024/normal_5faf035d3261c.pdfIn PDF document text
    • https://firerokuk.weebly.com/uploads/1/3/1/1/131164187/fdec08b206f0.pdfIn PDF document text
    • https://pinoxelu.weebly.com/uploads/1/3/4/1/134108818/gerejurivaba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393925/normal_5f90b24911d54.pdfIn PDF document text
    • https://wepeweguwerixum.weebly.com/uploads/1/3/1/8/131856135/1043407.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/gonafoziguwewe/67444492688.pdfIn PDF document text
    • https://s3.amazonaws.com/tenunud/terut.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/bolted_connection_nptel.pdfIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/81068596663.pdfIn PDF document text
    • https://s3.amazonaws.com/nuruvapozixix/broforce_unblocked_weebly.pdfIn PDF document text
    • https://s3.amazonaws.com/petuzutemixuvod/64843433993.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_off0000cf14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF14 4816 bytes
SHA-256: c8ed8e07e8be4dd1c7f9f41a536f1ce464565e5879f2443af721f2748941e3e6
font_01_sfnt_off0000df83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF83 11540 bytes
SHA-256: 08d39146bffdcbeb67e67304059b3915a660e6013ebf736ad434e8b57ad37359

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