Malicious PDF — malware analysis report

Static analysis result for SHA-256 225c977b90c86fb7…

MALICIOUS

PDF

72.6 KB Created: 2021-04-19 18:11:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 6ce8df4fae25b8ec21eabad4196b8309 SHA-1: e398a4d6d02bd95dec0a969a2fa75aa419e7575d SHA-256: 225c977b90c86fb7aab5d702f01d3f3a500932cd8dec6d06eb9604ac0176f322
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users. The primary malicious URL identified is zajinet.ru, which is likely used to host a phishing page or distribute further malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or credential harvesting.

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://zajinet.ru/strik?utm_term=using+and+understanding+mathematics+5th+custom+edition PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378619/normal_601a2c37b1b7e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480594/normal_5fef6aa9d3e6f.pdfIn PDF document text
    • http://pawusewi.sportsontheweb.net/2013_honda_civic_service_manual.pdfIn PDF document text
    • https://vuzazaba.weebly.com/uploads/1/3/0/8/130813658/kezuvowupopepedibi.pdfIn PDF document text
    • https://puwulafu.weebly.com/uploads/1/3/5/3/135329465/723757.pdfIn PDF document text
    • https://junimadegerozo.weebly.com/uploads/1/3/4/0/134096607/jubofojex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386848/normal_5fe401519aa51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378604/normal_602696a8e338f.pdfIn PDF document text
    • https://jakuvuwokuguges.weebly.com/uploads/1/3/4/8/134891264/duwuvoseles.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393502/normal_606299d5ca6f7.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/vizegemawokaxe/harry_potter_characters_quizlet.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/dark_tower_imdb_parents_guide.pdfIn PDF document text
    • http://vakifavu.onlinewebshop.net/c_band_satellite_dish_installation_manual.pdfIn PDF document text
    • http://rufirokexud.epizy.com/occupational_psychology_textbook.pdfIn PDF document text
    • http://parubixus.rf.gd/navodalorokoluru.pdfIn PDF document text
    • http://kijolitenelofon.epizy.com/vekaxowamigugakokofawi.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_off0000dc79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC79 5436 bytes
SHA-256: f4c4d889dac76f5506b6fce135f7a4424a83e5f8e2f89efc0f6f0cf9037fba08
font_01_sfnt_off0000eed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED5 11684 bytes
SHA-256: 4a531a613aad433a287562e107b43921a3876f9dfcf2b66c3cbcfb6ad264eb67

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