Malicious PDF — malware analysis report

Static analysis result for SHA-256 21a4ba5d7323022c…

MALICIOUS

PDF

74.3 KB Created: 2021-02-17 10:03:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: f47530b4a2fe71fad115b2bab9f459d1 SHA-1: c9a3eb7b74fcfae516d5637a22f0a11aff698074 SHA-256: 21a4ba5d7323022ccd6ff6f03ad290054dce5865c58b38e20884972e6f9087f5
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, with one prominent URL pointing to 'bologen.ru' which is associated with a phishing lure regarding deposition objections. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests a malicious intent to distribute content via disposable hosting.

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://bologen.ru/strik?utm_term=california+deposition+objections+deadline PDF link annotation
    • http://mnclassis.org/ccna_200-_125_dumps_9tutpq91g.pdfIn PDF document text
    • https://xovewelokajefi.weebly.com/uploads/1/3/4/8/134864882/7623619.pdfIn PDF document text
    • http://chatik85939775.fun/charles_dickens_david_copperfield_freeze9cx.pdfIn PDF document text
    • http://nasporte1.fun/fundamentals_of_biochemistry_life_at_the_molecular_level_3rd_editionmlo24.pdfIn PDF document text
    • http://degitowexara.iblogger.org/53942799866.pdfIn PDF document text
    • http://mozodulo.iblogger.org/ragumanakonimuva.pdfIn PDF document text
    • https://cdn.sqhk.co/resasenubori/cheBohe/samoveg.pdfIn PDF document text
    • https://limejanokevipa.weebly.com/uploads/1/3/0/7/130739330/9420e388633d.pdfIn PDF document text
    • https://zejobivajetipud.weebly.com/uploads/1/3/0/7/130740466/bogosurokuwogixe.pdfIn PDF document text
    • http://hh666o.site/25837439300mfaz8.pdfIn PDF document text
    • http://service-hire.com/wakozojunodozajexutubepop790du.pdfIn PDF document text
    • https://toviladul.weebly.com/uploads/1/3/0/7/130776498/9753375.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bivoxubi.epizy.com/66689029519.pdfIn PDF document text
    • http://talagolow.rf.gd/44023269677.pdfIn PDF document text
    • http://momerizimapunu.epizy.com/matching_shapes_worksheets_for_toddlers.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_off0000e502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE502 5268 bytes
SHA-256: 3e060983660be5506e9f04d72a04059b87d233be6a6f81e69ff4ed1c64cbdd5c
font_01_sfnt_off0000f6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F7 10912 bytes
SHA-256: 207ac5bbfdf5c1d11946c2c60244e111a88fa92a4149a5c3449ab68bf4bcf5fb

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