Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba74c94c402d5894…

MALICIOUS

PDF

71.1 KB Created: 2020-12-20 11:06:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 92cd7adf39a6d7fbb06498a8c5e7c858 SHA-1: 9f2212863784fc1ff0dc7b326690f1ea89df50be SHA-256: ba74c94c402d58948312219292a3f17f98df512bf52077c00f4a9d3c665f827b
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://traffnew.ru/123?utm_term=dna+worksheet+pdf+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386366/normal_5fb71601d5add.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494877/normal_5fd7d96d20374.pdfIn PDF document text
    • https://tarirubawapub.weebly.com/uploads/1/3/1/6/131606173/lupadutapa_kosub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479710/normal_5fbb69109b178.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421201/normal_5f9de8f9d3c61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393893/normal_5f9722da7f850.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365525/normal_5f870bddb3caf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374951/normal_5f8e6429ea6a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411229/normal_5f97d971e16e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466368/normal_5fae6c0914241.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/af0e2718-4753-4688-984f-de91e586a319/wafulasisesin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d35455e1-16e7-4e26-a3d3-b1e65c471e3f/nefrologia_clinica_avendao_4ta_edic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e581bdd4-3405-4ed7-a3e9-620d1ee192b2/6516298346.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

Related samples 5

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E1 5252 bytes
SHA-256: f9aa75882c82f2574091a710b4c7f9177efeaa847d9eb4c3964cbdb555bb153b
font_01_sfnt_off0000ebd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD9 10616 bytes
SHA-256: 81d187b3b838b1c3badd6c52ac98ea2a11a1f8630f5445534e788925146a283c

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