Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b612deb0d8d3712…

MALICIOUS

PDF

75.8 KB Created: 2021-03-24 10:37:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d6aadb89c141566aa66b22366e91ec31 SHA-1: 73b054f5d9040f4dd008558f530bf474a6465cdd SHA-256: 9b612deb0d8d37124f14128d181b45529a36fcf639350947229c120e1ad731d4
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of numerous external URLs implies an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/strik?utm_term=char+broil+tru+infrared+4+burner+review PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369766/normal_605594c47d917.pdfIn PDF document text
    • https://bapuporodotuxo.weebly.com/uploads/1/3/1/3/131381531/wudabi.pdfIn PDF document text
    • https://cdn.sqhk.co/fujotojaxob/aiaWKji/54979385.pdfIn PDF document text
    • https://gatamerat.weebly.com/uploads/1/3/4/0/134000446/medozaganunek.pdfIn PDF document text
    • https://moxidoneke.weebly.com/uploads/1/3/5/9/135993461/kopim_dufajagepu_dolibefaxiwe.pdfIn PDF document text
    • https://cdn.sqhk.co/limiwebu/f8hbghm/tank_battle_3d_world_war_ii_mod_apk.pdfIn PDF document text
    • https://libotavod.weebly.com/uploads/1/3/0/8/130813055/978219.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464851/normal_5fc99ab870b9e.pdfIn PDF document text
    • https://wovofonunubani.weebly.com/uploads/1/3/1/4/131408017/9392115.pdfIn PDF document text
    • https://cdn.sqhk.co/sodelaranu/DkKMijB/sawodobebevuzef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489045/normal_5ff806450df3c.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/hhjdhid/43068504625.pdfIn PDF document text
    • https://cdn.sqhk.co/pefevepufi/nijWwX6/mekoligafofimolewi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485448/normal_6023542f263c1.pdfIn PDF document text
    • https://nuvarimo.weebly.com/uploads/1/3/1/3/131378817/sojijusese.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450249/normal_5feeec42a3bc8.pdfIn PDF document text
    • https://nibapexi.weebly.com/uploads/1/3/0/9/130969889/3797753.pdfIn PDF document text
    • https://mejojesakawevud.weebly.com/uploads/1/3/1/4/131438193/7040037.pdfIn PDF document text
    • https://cdn.sqhk.co/pomisiforuko/Ujfjage/royal_chaos_heir_guide_part_2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://728bf1be-24e3-4891-ba98-fedceca1a503.filesusr.com/ugd/3268c8_c32f6f8a742e46eab42d9379d646a4d3.pdf?index=trueIn PDF document text
    • https://e8677ced-6330-435e-8237-200fb10408a4.filesusr.com/ugd/a4c1fa_e8f86498a9e84e0198b789c640ce5e3b.pdf?index=trueIn 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_off0000e9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CF 5100 bytes
SHA-256: 3fe7768f030186f2f3d76630cfbd067f36ca2fac347ba3579c76579f3d47cca8
font_01_sfnt_off0000fb36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB36 10940 bytes
SHA-256: 341e8c9264f0119ff4c42c4604fa65b5256970539fcc7698c931531cc61abc2a