Malicious PDF — malware analysis report

Static analysis result for SHA-256 836fe16bfa69ca96…

MALICIOUS

PDF

77.2 KB Created: 2021-03-02 16:51:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 80f246e31072961b71912f6c97f7cfd1 SHA-1: 9deee9cd5ea6860aef279af17c3cd06caeb6eca2 SHA-256: 836fe16bfa69ca963848ceb628053d940325dfe3eb05b8f4063aac1a4361e407
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/strik?utm_term=warcraft+chronicle+volume+3 PDF link annotation
    • https://cdn.sqhk.co/lafugafeniki/bgjS5ih/red_pepper_in_italian.pdfIn PDF document text
    • http://investorlands.ru/component_2_contextual_information_sheetwj4i5.pdfIn PDF document text
    • http://dorulezebum.sportsontheweb.net/are_smoke_alarms_interchangeable.pdfIn PDF document text
    • http://epaytds.xyz/teliguzofifajuzeletesazixy81.pdfIn PDF document text
    • http://reduslimitaly-official.website/coroner_s_inquest_reports_lancashirepgxmm.pdfIn PDF document text
    • http://granitmetrospecstroy.ru/78396207920ur816.pdfIn PDF document text
    • http://kumululurug.scienceontheweb.net/50224992435.pdfIn PDF document text
    • http://helpforteam.com/meme_soundboard_ultimate_2020_scratchiu7mx.pdfIn PDF document text
    • http://neojust.ru/83151881493fbkfa.pdfIn PDF document text
    • http://fajujefa.getenjoyment.net/walusuvesakifatix.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/mukiluduxivabixopuxoz.pdfIn PDF document text
    • https://s3.amazonaws.com/donukadizolin/viliboroziwubawutami.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/21439284898.pdfIn PDF document text
    • http://nosigegu.onlinewebshop.net/26543987978.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_off0000f124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF124 5180 bytes
SHA-256: 7097acb5b51a9bf8b66a64e184d51f74dabdea4ee793ed58d283bfbaf62dae81
font_01_sfnt_off000102b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B3 10936 bytes
SHA-256: 9d0629e682f3ef04874c96460bc5a5a1b51ee09f05fb300320172d855f2e48c5

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