Malicious PDF — malware analysis report

Static analysis result for SHA-256 a985a8d5165efbb4…

MALICIOUS

PDF

69.9 KB Created: 2021-03-02 16:27:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f8b29c68a8dfac8428e5a7808d0b82a7 SHA-1: bc35bd095f99a47a96f228a9ffbbc5117b67412c SHA-256: a985a8d5165efbb4f212b4702d8d3d3d4d9f869df53dbb8ca955c648ed42aca7
126 Risk Score

Malware Insights

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

The sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The PDF contains a large number of embedded URLs, many pointing to disposable domains, consistent with a link farm used for phishing or malware distribution. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest this is a malicious document designed to redirect users to harmful content.

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://maypoin.ru/strik?utm_term=will+cyberpunk+2077+be+60+fps PDF link annotation
    • https://cdn.sqhk.co/lukedivibeb/hiimd2w/vavikakufana.pdfIn PDF document text
    • https://fuvipizewovotat.weebly.com/uploads/1/3/1/0/131069886/fe967e4fa0507.pdfIn PDF document text
    • https://cdn.sqhk.co/lepavenujal/9hilr8H/4574543688.pdfIn PDF document text
    • http://pofaduxiruk.getenjoyment.net/samsung_un55ju6700f_wall_mount.pdfIn PDF document text
    • https://cdn.sqhk.co/lopokevofoti/iSwDeJL/soredasofapepu.pdfIn PDF document text
    • http://nijubuwuw.iblogger.org/beyonce_songs_halo.pdfIn PDF document text
    • https://sibitolifi.weebly.com/uploads/1/3/4/7/134732274/bavojexis.pdfIn PDF document text
    • https://sufifova.weebly.com/uploads/1/3/4/7/134736026/9666178.pdfIn PDF document text
    • http://nitesufi.sportsontheweb.net/how_we_use_kinetic_energy_in_our_everyday_lives.pdfIn PDF document text
    • http://sidixul.iblogger.org/91085000785.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feduneve.rf.gd/rurutepuvufege.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/hillstream_loach_care_sheet.pdfIn PDF document text
    • http://punegejofuj.epizy.com/brahmavidya_breathing_exercises.pdfIn PDF document text
    • http://pefasadidalaw.epizy.com/44180872006.pdfIn PDF document text
    • http://zugiwonurubenaz.epizy.com/53657384741.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/60402236682.pdfIn PDF document text
    • http://wokarodefi.onlinewebshop.net/vuwenipesotu.pdfIn PDF document text
    • http://xifogufog.epizy.com/oxford_bookworms_stage_2_indir.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/calcium_rich_foods_chart.pdfIn PDF document text
    • http://japivolenalu.epizy.com/bluestacks_for_pc_windows_10_filehippo.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_off0000d4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AF 5624 bytes
SHA-256: 0d28c215d9bb8ec9112145832afc5e4335fa1156702acc1d840b00c275f5d731
font_01_sfnt_off0000e80c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80C 10084 bytes
SHA-256: e441944306dbe5d08711ad7ef85024b33f1c80ecb872dbe441132a94afead91b

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