Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9a41c6bb0acc7c4…

MALICIOUS

PDF

76.5 KB Created: 2021-03-31 08:32:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: cbc982977398182e34ec977b7aef146d SHA-1: a595f247ec0418291cb830553e40136364916def SHA-256: b9a41c6bb0acc7c4253710cc46db528feb607305d0e1c31c54c20bf6b9e6846f
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs pointing to link farms and disposable hosting, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://soxebez.ru/award?keyword=adultery+judgement+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4367277/normal_60070087d844f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468812/normal_6035cebaa8745.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452400/normal_6024a0efc99a1.pdfIn PDF document text
    • http://ninuwekevap.scienceontheweb.net/cual_es_el_proceso_de_investigacion_cualitativa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449406/normal_6043c0d10ea79.pdfIn PDF document text
    • http://mizejodaf.mywebcommunity.org/sipegujemibagax.pdfIn PDF document text
    • http://jawixogu.mygamesonline.org/abstract_reasoning_test_with_explanation.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366976/normal_603b04ebea052.pdfIn PDF document text
    • https://cdn.sqhk.co/wojusipi/g2hjal7/rososo.pdfIn PDF document text
    • https://cdn.sqhk.co/pixefavenar/thhieie/groupon_merchant_services_telephone_number.pdfIn PDF document text
    • https://cdn.sqhk.co/sufadoma/hgWggjj/nostalgia_definition_english.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480756/normal_5fcecfa56a947.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489411/normal_60160add48c04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410731/normal_6012dad760f3d.pdfIn PDF document text
    • https://cdn.sqhk.co/xekemini/hjcl0ib/live_bingo_games_near_me.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500447/normal_5ff7773825485.pdfIn PDF document text
    • http://vivekawiga.sportsontheweb.net/molesevumad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kisalonokexiwi.atwebpages.com/audit_procedures_examples.pdfIn PDF document text
    • http://xoxekojut.onlinewebshop.net/anthrax_and_bioterrorism.pdfIn PDF document text
    • http://makakanow.onlinewebshop.net/laraxisetiwipak.pdfIn PDF document text
    • http://bizedesaxifu.onlinewebshop.net/4699629503.pdfIn PDF document text
    • http://vizozaforuf.atwebpages.com/jegowanifuxesejeg.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_off0000ee07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE07 5140 bytes
SHA-256: e1e5d845b99d1c9dd8e6d338a22faabb0e609af838f5a8f59226581ddd098ff1
font_01_sfnt_off0000ff84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF84 11000 bytes
SHA-256: 231878dd3ed38363d758fcab5c79345b9bddb7e6d2e3d2c8ecdab603b2668256

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