Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb27202563487430…

MALICIOUS

PDF

71.1 KB Created: 2021-01-21 15:22:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: cb1ab8440baea193b93dbc9005cb9ddd SHA-1: 97afd5e3d062372d2822ad7002f80f4d758e9e65 SHA-256: eb27202563487430db53dca9b895c2f6049c9cfd1f9b3f8b4df0f0e66ec8c8c0
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a primary suspicious URL being https://bologen.ru/123?utm_term=brian+azzarello+joker+review. Heuristics indicate this PDF is part of a link farm on disposable hosting, and ClamAV detected it as Pdf.Phishing.Trojan. The document body, though heavily obfuscated, appears to contain metadata related to a review, suggesting a lure to a malicious site. No scripts were extracted, but the PDF structure and embedded links strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=brian+azzarello+joker+review PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4470962/normal_5feb19bdca1c5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491965/normal_5feff2fe25907.pdfIn PDF document text
    • https://site-1167954.mozfiles.com/files/1167954/epic_games_rocket_league_not_launching.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386829/normal_5fd68db75fbaf.pdfIn PDF document text
    • https://site-1175739.mozfiles.com/files/1175739/grass_cutter_machine_repair_near_me.pdfIn PDF document text
    • https://feraresafobigim.weebly.com/uploads/1/3/0/8/130813798/kixunaruna-tukirimige.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368506/normal_5f8ffa792ad6d.pdfIn PDF document text
    • https://vamemaxodoj.weebly.com/uploads/1/3/1/4/131437173/4438023.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416811/normal_5fed1a15cee9a.pdfIn PDF document text
    • https://ketadamofexawun.weebly.com/uploads/1/3/5/3/135349072/mejigalugipuno-kafitezusuzizo-maketij-dezazolovutiga.pdfIn PDF document text
    • https://site-1175657.mozfiles.com/files/1175657/latest_bollywood_movies_site_free.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/ragejufa/28592661751.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/83094538000.pdfIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/pantpradhan_awas_yojana_gramin_online_form.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/64876020078.pdfIn PDF document text
    • https://s3.amazonaws.com/wegugus/zimazozazebokerewimiw.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_off0000d9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AE 4892 bytes
SHA-256: 0ce3a9d9391e6bc2ca5fe5f67ad5485266f27582692c24949c48dce5eaa2d2df
font_01_sfnt_off0000ea7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7C 10912 bytes
SHA-256: 1a4706caf459f7e20dece0de03e067349579a32a910e9800d03f15a159acedef

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