Malicious PDF — malware analysis report

Static analysis result for SHA-256 20842293d22507bf…

MALICIOUS

PDF

78.7 KB Created: 2021-06-01 04:06:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 1338cf8d425c82ebffe9206a85ee82d0 SHA-1: 4ca49c62e635f4ce16db3db005e2f00c888835d3 SHA-256: 20842293d22507bfbbb7017fbb3ffc1cca70094649d46ac2e403c19d2131065f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external links, with a significant portion hosted on disposable domains, suggesting an attempt to manipulate search engine results or redirect users to potentially harmful content. The document body is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://lirupije.weebly.com/uploads/1/3/1/6/131606624/vowuxex_dojebiforiru.pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4475863/normal_606e75232f5a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482636/normal_6014dcd45ac31.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489983/normal_5fff4b7683f6c.pdfIn PDF document text
    • https://lidimegofomizut.weebly.com/uploads/1/3/1/3/131380930/3626691.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426828/normal_60240d9d14706.pdfIn PDF document text
    • https://wobozosexeje.weebly.com/uploads/1/3/0/8/130814788/0a74a740072.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/G1IkLG9TFNM/wb?keyword=how%20to%20remove%20a%20stanley%20pocket%20doorPDF link annotation
    • https://uploads.strikinglycdn.com/files/db472a6b-3cc9-46e3-99df-8ccab58b71f8/muzatemapupixawaxobinebe.pdfIn PDF document text
    • http://wusagem.pbworks.com/w/file/fetch/144439488/tolagazanofutazosob.pdfIn PDF document text
    • http://kedetuwi.pbworks.com/f/39263236131.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3a628e0-7478-4ae7-b961-e05f0e28e09f/whats_the_purpose_of_warranty_deed.pdfIn PDF document text
    • http://kibumezi.pbworks.com/f/pure_sweat_basketball_skills_workout_for_fun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f44658a0-f188-4e45-9014-0b28f9947afe/kigag.pdfIn PDF document text
    • http://mumasenekera.pbworks.com/w/file/fetch/144423954/limutizip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6936c93-8e79-4548-bfd9-0afa4d5ab163/ge_oven_326b1230p001_error.pdfIn PDF document text
    • http://lebunurivugu.pbworks.com/w/file/fetch/144439776/family_tree_printable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bab70cd-3867-4c6e-9980-b74ed1209551/mfj_989c_parts.pdfIn PDF document text
    • http://nusuwoxub.pbworks.com/w/file/fetch/144413703/86359806673.pdfIn PDF document text
    • http://supatibu.pbworks.com/w/file/fetch/144428739/96535859996.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c47eee5-7c45-43ff-b123-5e134f9c3374/reading_comprehension_questions_grade_10.pdfIn PDF document text
    • http://rujuboxu.pbworks.com/w/file/fetch/144439941/nimevoxobigiredabaju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/816c5ec2-cedc-4312-ad76-6d76b75d41eb/ragagazuzoxokemorenafi.pdfIn PDF document text
    • http://midevodimu.pbworks.com/f/taylor_swift_google_drive_mp3.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_off0000f340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF340 5500 bytes
SHA-256: e7e9a3caaa79173a0c9ea3b807e3e7712e19d503b829d2bcee01a0461a9fcc38
font_01_sfnt_off000105f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F5 11144 bytes
SHA-256: 55456183ffe7dab62c7176e57c9f1b6a144ea2b5f943223017dfce1135c40d43