Malicious PDF — malware analysis report

Static analysis result for SHA-256 25a4a86a87160350…

MALICIOUS

PDF

76.1 KB Created: 2021-03-08 06:07:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6bac876d48d0c258d83047206856b18 SHA-1: 7eeb60b94eeae0437927a837ee51cd9b0435f36e SHA-256: 25a4a86a871603507306e949e1af47ab7db27f8367e2e0258b18e5505259ed65
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, suggesting a phishing or scam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and external links point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/aws?utm_term=how+to+apply+for+food+stamps+in+passaic+county+nj
    • https://cdn-cms.f-static.net/uploads/4409093/normal_601fd72244c54.pdf
    • https://cdn-cms.f-static.net/uploads/4427293/normal_6034c6ba46ee9.pdf
    • https://cdn-cms.f-static.net/uploads/4403823/normal_6025b8aae3cc0.pdf
    • https://static.s123-cdn-static.com/uploads/4454556/normal_5fff96793a666.pdf
    • https://cdn.sqhk.co/pinofizulag/fWjgDRM/85820474140.pdf
    • https://cdn.sqhk.co/wolanojijen/j6Viiiz/pregnancy_announcement_template_for_facebook.pdf
    • https://toxavepudu.weebly.com/uploads/1/3/4/6/134634724/1157936.pdf
    • https://cdn-cms.f-static.net/uploads/4451368/normal_5fd805e2b6972.pdf
    • https://cdn-cms.f-static.net/uploads/4387586/normal_60172211d9a5a.pdf
    • https://jibizixowaxen.weebly.com/uploads/1/3/5/2/135296653/0e312410ee7.pdf
    • https://cdn-cms.f-static.net/uploads/4420907/normal_60286c969f5e7.pdf
    • https://semuzotefol.weebly.com/uploads/1/3/1/4/131437619/1112162.pdf
    • https://cdn-cms.f-static.net/uploads/4415051/normal_5fdc0e0ed522a.pdf
    • https://cdn-cms.f-static.net/uploads/4474739/normal_604140e5422a8.pdf
    • https://cdn.sqhk.co/vujaderaz/uTbDidY/singing_elsa_doll_show_yourself.pdf
    • https://cdn-cms.f-static.net/uploads/4407733/normal_602b4530bce60.pdf
    • https://cdn.sqhk.co/tokofape/KhgXjjn/woodworking_plans_projects_uk.pdf
    • https://cdn-cms.f-static.net/uploads/4388617/normal_602b068505334.pdf
    • http://xifadezuzurap.medianewsonline.com/inception_screenplay_book.pdf
    • https://cdn.sqhk.co/pesenexur/geibihj/mizefoxefileperiwaxisuguw.pdf
    • https://cdn-cms.f-static.net/uploads/4375357/normal_5fe84e181a22b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://siniligavaxuvul.onlinewebshop.net/senezawotomozuliv.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaf3.bin
ea600a9664e165d87e93eff5a25096d1c41af5802621a0cd9f584887054dcc33		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF3 5532 bytes
font_01_sfnt_off0000fdce.bin
8458cf43ab678eefdf6e81dbc57ef3a2072a3c158d608722bea75455f6bcc14f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCE 10720 bytes

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