Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3a625ccd62c7082…

MALICIOUS

PDF

73.2 KB Created: 2021-02-18 15:25:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 6f5e3fd2361d55ba86c9c3603a3b2ac3 SHA-1: 80fb8beed10d5031548dfdb353dc7b4345444514 SHA-256: c3a625ccd62c7082b02e5c40eb905c74a176dc8d37a340797f49271a81dfd468
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it's part of a link farm designed to drive traffic to various websites. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, and the primary embedded URL points to a keyword-related page. No scripts were extracted, but the presence of many external links indicates a likely SEO scam or phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://leonvi.ru/wix?keyword=anglo+saxons+food+and+drink+facts PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4495550/normal_5fee2f387991e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487007/normal_5fd61dfc14f7d.pdfIn PDF document text
    • https://jedifubebevaze.weebly.com/uploads/1/3/4/8/134873515/ririmem_momijigenu.pdfIn PDF document text
    • https://gosopitodemeku.weebly.com/uploads/1/3/4/8/134874694/ramazu_ximizoxumomo_mewexus_zigadazorod.pdfIn PDF document text
    • https://cdn.sqhk.co/lusikagidet/hgebjax/kuwanigagupelalope.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497093/normal_600a9c1f333bf.pdfIn PDF document text
    • https://lizakefamejoxen.weebly.com/uploads/1/3/1/3/131384135/xomigotij.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/hhiQ5kN/kalesase.pdfIn PDF document text
    • https://kokujilu.weebly.com/uploads/1/3/1/4/131453241/7572250.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368224/normal_5ff05c228fa8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418788/normal_6017ced7119c4.pdfIn PDF document text
    • https://cdn.sqhk.co/tajudozizif/eLgcIcI/49022219683.pdfIn PDF document text
    • https://cdn.sqhk.co/javeduner/5DhG1pt/kizad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B1 5312 bytes
SHA-256: be6968efcf17c6d69d32c9d5343f2584e11076bb7c8da45039766e8a1f24fd54
font_01_sfnt_off0000f5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DE 9904 bytes
SHA-256: 3aeb3016122e8547cbd51ac3549dd2614345464126f08e8f093b30f7aea37bcd