Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8c0950662d9cc5f…

MALICIOUS

PDF

144.9 KB Created: 2021-04-09 23:17:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 962edc04a98e93477f49cf1070c8918d SHA-1: 6416491923234e31a6e98584f320d3f3c5d18eba SHA-256: c8c0950662d9cc5f837fe1826edd28236b8c3fd64ee70377307f7f4db02c813b
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a date, but no clear textual lure. The presence of multiple external URIs and the link farm heuristic strongly suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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=gurps+zombies+pdf+free PDF link annotation
    • http://zegererevez.medianewsonline.com/tagugugulobakajopidigavap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375521/normal_5ff13c6ddd256.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369927/normal_6035b7e16a8da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458148/normal_601c676147c9d.pdfIn PDF document text
    • https://cdn.sqhk.co/kuniremolu/a1NgeNf/bike_race_app_tips_and_tricks.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375340/normal_6055b84295fca.pdfIn PDF document text
    • http://matimomewojime.mypressonline.com/lubavirivu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426267/normal_5fe78aa0cecf8.pdfIn PDF document text
    • https://cdn.sqhk.co/xipepovivik/aXsogdL/39210425407.pdfIn PDF document text
    • http://gexopidikimo.mygamesonline.org/23223521577.pdfIn PDF document text
    • http://daludaja.getenjoyment.net/384677477.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413575/normal_60210c821e125.pdfIn PDF document text
    • https://cdn.sqhk.co/mobubivifa/ejgiEeG/19032902015.pdfIn PDF document text
    • http://palupalukagu.mygamesonline.org/sovowedamofoxajajonupisof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490725/normal_602cf5cd35e83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376127/normal_604e6eea0a415.pdfIn PDF document text
    • https://cdn.sqhk.co/xusezasaj/jgfPibF/ibm_rational_requisitepro_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/da281907-7a27-4d92-9b43-d520eb6bca68/this_is_amazing_grace_bethel_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80972c1e-48c9-48a0-a3f8-45cf152d78ed/xerox_workcentre_7835_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e43c622-06d8-4b5f-b4d2-285fcd52292a/final_cut_pro_x_trial_crack_macos_catalina.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/371cdbe0-2649-4e98-a8c6-a11150d9c7b5/robertshaw_thermostat_instructions.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19484 26196 bytes
SHA-256: 3211b123526a5d2b013bd010c7df73d32d1bd39c6f5c80c842ea7a97f0193f12
font_01_sfnt_off0001e5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E5D4 5168 bytes
SHA-256: dc51d8e5bc6b7cb0b4afd82aebff95e8d4df2f6853a77e7112e0a7b69f0b3993
font_02_sfnt_off0001f756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F756 12620 bytes
SHA-256: 81478b67064cda656b5cdcea3ab4d2b981bb37e067d5fd20d38d17c8fc1eeb57
font_03_sfnt_off00022086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22086 16092 bytes
SHA-256: 39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67