Malicious PDF — malware analysis report

Static analysis result for SHA-256 803f6459e37a2fa7…

MALICIOUS

PDF

77.0 KB Created: 2021-02-23 17:49:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 862724cd1d895a24bad8205424675e17 SHA-1: 8bb425ca505daee698e30731e39404b7840d2acd SHA-256: 803f6459e37a2fa78daef9210945692656a06961862d85b4321fdf855eba92b0
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated maliciousness. It contains numerous external URLs, many hosted on disposable domains or link farms, suggesting a phishing or malware distribution attempt. The document body, though partially corrupted, contains text related to a fraction and the wkhtmltopdf application, indicating it was likely generated programmatically to obscure its malicious intent.

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://seumenha.ru/123?utm_term=cuanto+es+1%252F8+de+pulgada PDF link annotation
    • https://cdn.sqhk.co/vefusujix/gfWifhg/cowboy_bebop_characters_dog.pdfIn PDF document text
    • https://cdn.sqhk.co/joninopi/ahaKggf/27369179102.pdfIn PDF document text
    • https://cdn.sqhk.co/ratugetaj/jajhBja/keselutukujojupexalujufip.pdfIn PDF document text
    • https://roturusuwanowus.weebly.com/uploads/1/3/4/3/134363773/gikisefunozo_movalix_jumixozunefe.pdfIn PDF document text
    • https://cdn.sqhk.co/teketerep/hhc8Wge/installer_un_mod_skyrim_manuellement.pdfIn PDF document text
    • https://xabejelowubi.weebly.com/uploads/1/3/2/6/132695530/vaxibap.pdfIn PDF document text
    • https://winugemu.weebly.com/uploads/1/3/1/0/131070294/2096414.pdfIn PDF document text
    • https://cdn.sqhk.co/sofetarunox/gNPM4je/kalavoxifa.pdfIn PDF document text
    • http://fubozibir.iblogger.org/tisamokewipeguwobilixoz.pdfIn PDF document text
    • https://cdn.sqhk.co/ranemagesoga/1gjGvxC/elf_snowball_fight_game_online.pdfIn PDF document text
    • https://litolojinoforiw.weebly.com/uploads/1/3/4/7/134721995/menumux.pdfIn PDF document text
    • https://cdn.sqhk.co/lupekute/bxhkuy6/showbox_movie_app_for_pc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rufegojokod.epizy.com/58789276629.pdfIn PDF document text
    • http://puwoxigawezab.epizy.com/taleso.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_off0000d828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD828 5220 bytes
SHA-256: f3d3c134f703a7e778f48d0dd24400fcec0280bde2e6cda5719fcee1bd8827af
font_01_sfnt_off0000ea07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA07 11820 bytes
SHA-256: 2807d70f94f181497e58c27592bd865ed85fcbda981d2948d8a526540ee24d5c
font_02_sfnt_off000110d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D5 16100 bytes
SHA-256: 01e49661dbdd7b4823267156d85e4b6ddc25a6de2ac0af4d78c137cfa2b371b1

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