Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab833f5eb4d555b5…

MALICIOUS

PDF

91.2 KB Created: 2021-05-12 12:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: a0d8936450e39307c6f5fdba12771dae SHA-1: 1cb10278300d6820cc013c01066a26e03f259696 SHA-256: ab833f5eb4d555b5bec8434589cc0db4b71d2246fdde50b991a4760045357d1d
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs pointing to disposable domains and link farms, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://mezovuduw.ru/strik?utm_term=asrock+z77+pro3+overclocking+guide PDF link annotation
    • https://cdn.sqhk.co/xazururoxe/jby6981/1686646657.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489429/normal_5feb57efc5c3b.pdfIn PDF document text
    • http://online-sistem.site/sixunaffzrg8.pdfIn PDF document text
    • https://cdn.sqhk.co/mavikodezeke/ibShejb/sivuxaxematirid.pdfIn PDF document text
    • https://cdn.sqhk.co/bajipugotox/jadM5aX/armour_of_god_1986_full_movie.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383915/normal_5ff2254fd6917.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473645/normal_600c165711016.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371025/normal_6006f300bbcb7.pdfIn PDF document text
    • http://vizionsmc.net/good_christmas_trivia_questions_answerbzq5v.pdfIn PDF document text
    • http://naturapple.space/91001807352ok97n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421224/normal_606e998f3513a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485927/normal_6039a358e9b8a.pdfIn PDF document text
    • https://cdn.sqhk.co/tebefaravuz/Ehjgfic/lazorusovanu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372354/normal_6042043dc3333.pdfIn PDF document text
    • https://cdn.sqhk.co/gabebutiz/jqcVhgE/hairstyles_for_black_toddler_boy_with_long_hair.pdfIn PDF document text
    • http://fringigejy.site/enterprise_grammar_4_answers3n2o3.pdfIn PDF document text
    • https://cdn.sqhk.co/zewumirapeb/gcooif0/wopafi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368742/normal_60044b61e4fcb.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/dufekifaral/90391196972.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/nurumafobafovetep.pdfIn PDF document text
    • https://s3.amazonaws.com/desekusoxi/what_is_the_main_idea_of_into_the_wild.pdfIn PDF document text
    • https://s3.amazonaws.com/lorerexeg/jibebe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010fd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD7 5440 bytes
SHA-256: 2babace7fe1d7e6595d81bebe7c794fb5cb213865631e4627082da196935b7b2
font_01_sfnt_off00012286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12286 11688 bytes
SHA-256: 303b463134e0f5d12460ee83987bb675f6f12c9491769e5534ba4cabab013db6
font_02_sfnt_off00014a5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A5D 16140 bytes
SHA-256: 159427b32ed66bfbde86def5e6c2992bde67dfb25400c4000a37c9b59b949b61

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