Malicious PDF — malware analysis report

Static analysis result for SHA-256 30b826e46dd56f00…

MALICIOUS

PDF

71.4 KB Created: 2021-01-16 14:02:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8ce9a62b93484104b685be8eaca84aae SHA-1: 7fdd6025d906c0589bb5a946554f5f215578d997 SHA-256: 30b826e46dd56f0004d18d90a17d94a415bfd6950e1726ebaa3f471c3df2212f
134 Risk Score

Malware Insights

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

The PDF contains an external URI pointing to a suspicious domain, and heuristic analysis indicates it's a link farm on disposable hosting, likely designed to redirect users. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The document body, though heavily obfuscated, contains a lure related to hacking a game, reinforcing the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafffi.ru/123?utm_term=how+to+hack+marvel+future+fight+without+human+verification
    • https://static.s123-cdn-static.com/uploads/4379611/normal_600169a709071.pdf
    • https://cdn-cms.f-static.net/uploads/4376852/normal_5f97cf0859c3b.pdf
    • https://cdn-cms.f-static.net/uploads/4426550/normal_5fe9cbf58df86.pdf
    • https://cdn.sqhk.co/vipujitebiki/rZ4Ylji/lesson_plan_activities_for_toddlers.pdf
    • https://cdn.sqhk.co/xedogigiloli/fifgXlI/super_brawl_quest_fun_shooting_battles.pdf
    • https://site-1178668.mozfiles.com/files/1178668/joluxiwejibakufuf.pdf
    • https://static.s123-cdn-static.com/uploads/4374178/normal_5ff5838b28aff.pdf
    • https://site-1227746.mozfiles.com/files/1227746/macy_s_holiday_flannel_sheets.pdf
    • https://cdn.sqhk.co/zerurukoraju/heGKgdM/super_arsenal_gun_idle_masters.pdf
    • https://site-1171749.mozfiles.com/files/1171749/difewexu.pdf
    • https://site-1183516.mozfiles.com/files/1183516/bujameb.pdf
    • https://site-1166749.mozfiles.com/files/1166749/ada_caries_risk_assessment_form_aged_6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xanunafojuloki/wejipejabowa.pdf
    • https://s3.amazonaws.com/zewimu/74252583348.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d82f.bin
a46845b79e4f270bffd6c74d8f2f1cc5318f2addd5b7404271aec94e21bb232d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD82F 5292 bytes
font_01_sfnt_off0000ea26.bin
848e382b1c1e5e7dc427bf0ed7f4ccfffcf3fbd7ea102ec3713fbf92a23179c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA26 11168 bytes

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