Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9836538b6de4061…

MALICIOUS

PDF

79.0 KB Created: 2021-01-12 00:53:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: c843b318013b934980e9bc02b0f43db1 SHA-1: a2d45820a1c6798baeeaef598088d57dd4c668b0 SHA-256: b9836538b6de4061ea7c257f043c7b2cb819dba41016e4bf45a58e45d51e3b7e
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file is classified as malicious, exhibiting characteristics of a phishing lure. It contains embedded links that redirect to known malicious infrastructure, specifically `https://ggtraff.ru/aws?utm_term=video+screen+capture+windows+7`. The document's content suggests a social-engineering tactic to trick users into installing browser extensions or updates, a common method for malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • 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://ggtraff.ru/aws?utm_term=video+screen+capture+windows+7 In PDF document text
    • https://site-1175017.mozfiles.com/files/1175017/how_do_you_learn_to_sing_better.pdfIn PDF document text
    • https://cdn.sqhk.co/povewepalu/Wgf8YxJ/wesley_umc_middletown_pa.pdfIn PDF document text
    • https://site-1168054.mozfiles.com/files/1168054/chess_pieces_moves_cheat_sheet.pdfIn PDF document text
    • https://site-1235182.mozfiles.com/files/1235182/netirojopojewij.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458852/normal_5ff19c0cb94fc.pdfIn PDF document text
    • https://site-1168207.mozfiles.com/files/1168207/star_wars_actors_died.pdfIn PDF document text
    • https://site-1246108.mozfiles.com/files/1246108/bevasimovadomesonarotakaj.pdfIn PDF document text
    • https://site-1174730.mozfiles.com/files/1174730/anime_soundboard_for_discord.pdfIn PDF document text
    • https://cdn.sqhk.co/refowofiros/XYYC6ig/afk_arena_guild_master_guide.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/gelawiweza/carroll_court_reporting.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/materialismo_espiritual.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_off0000f6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AD 5172 bytes
SHA-256: 2b4f97afabb71b7bb809c5d28111331a838896e96bffd68c557acaafc289c013
font_01_sfnt_off00010873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10873 11424 bytes
SHA-256: ed3de070d479916150be35645f2b1ad51bbc136c22857c73a071916a11254f5f

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