Malicious PDF — malware analysis report

Static analysis result for SHA-256 058e90586cd7f99a…

MALICIOUS

PDF

71.6 KB Created: 2021-02-24 04:07:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 8adf3f22fbc4f39434d73239006fa93a SHA-1: e7320d98f6aecadfd1af2f59e03b0ba46641e904 SHA-256: 058e90586cd7f99a5909553daae68ee7c1d202b42001cb45d826428d54051692
126 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to 'cracked apk' and 'wkhtmltopdf', indicating a lure for potentially pirated software.

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://seumenha.ru/123?utm_term=a%252B+vce+cracked+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4463830/normal_5fd67d8222c9c.pdfIn PDF document text
    • https://cdn.sqhk.co/gefimiwotux/shj23b6/best_train_simulator_games_for_pc_download.pdfIn PDF document text
    • https://cdn.sqhk.co/tosilura/bGCHGbx/13420643963.pdfIn PDF document text
    • http://nekimul.22web.org/gelatine_sheet_to_powder_conversion.pdfIn PDF document text
    • https://cdn.sqhk.co/xadakede/vZo7Chj/61989737434.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417648/normal_5fd0368db7d6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383128/normal_601bcb2b94965.pdfIn PDF document text
    • http://udilische.club/jirewopupenikaxukn2rne.pdfIn PDF document text
    • https://cdn.sqhk.co/dutedape/gdgcxVp/74801039105.pdfIn PDF document text
    • http://organic100.fun/trigonometric_ratios_milliken_publishing_companyavexq.pdfIn PDF document text
    • https://cdn.sqhk.co/jukusenefow/P4gjjhh/hillside_drive_game_tips.pdfIn PDF document text
    • https://cdn.sqhk.co/kavonalitego/OhdK4je/rugby_world_cup_2020_dates.pdfIn PDF document text
    • http://gatorama.site/dotazuxarurgy15m.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzosexiwugu/jbCejbE/red_rose_tea_bags_breaking_open.pdfIn PDF document text
    • https://cdn.sqhk.co/figegixo/dhcgegd/gumevolipopavumu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393489/normal_6001272eaa8cc.pdfIn PDF document text
    • http://evgeniy-semenenko.ru/the_millionaire_next_door_audiobook_mp3mzsv8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD18 4968 bytes
SHA-256: 8e375eb11a982b11b3106b51007783259369466d1321f89e815c0b90404ca691
font_01_sfnt_off0000de12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE12 1796 bytes
SHA-256: 68bbe42c93759ab90c218695aa25c1747b40456063d11b0ac06b51d2514fd3e6
font_02_sfnt_off0000e69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69D 14336 bytes
SHA-256: 4757ba9f34b077491723e0b29b4aee604e01035bf5f4d8da3c3e824f1d1d471c

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