Malicious PDF — malware analysis report

Static analysis result for SHA-256 91866c94cf01b435…

MALICIOUS

PDF

72.1 KB Created: 2021-03-16 22:57:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 98b851f74e98a074a14abd0fbd38a334 SHA-1: e2aacd48299ea6888204fed2276ef206ba15eedf SHA-256: 91866c94cf01b435514d3c8d18c2c9f335dd21846356baa83a2ccf6c33e4e744
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zajinet.ru/award?keyword=campylobacter+jejuni+factores+de+virulencia+pdf PDF link annotation
    • https://cdn.sqhk.co/rabuvimi/hdgchh1/vh1_app_roku.pdfIn PDF document text
    • https://cdn.sqhk.co/sabimejuka/fiiFihO/84926760479.pdfIn PDF document text
    • https://cdn.sqhk.co/tategupet/jhn0hc0/zombie_haters_mod_android_1.pdfIn PDF document text
    • https://cdn.sqhk.co/pelonulu/jjiBEJw/gofoparubenopixoso.pdfIn PDF document text
    • https://cdn.sqhk.co/gedugari/SgfE3xY/3809879416.pdfIn PDF document text
    • https://cdn.sqhk.co/fomanazoravu/djfjfia/67912920727.pdfIn PDF document text
    • https://cdn.sqhk.co/jogepirar/isjjXhb/ottumwa_iowa_gangs.pdfIn PDF document text
    • https://cdn.sqhk.co/gagunewatevo/M6OggTP/dragon_ball_intro.pdfIn PDF document text
    • http://vizilirudigub.getenjoyment.net/vampire_diaries_cast_season_3_episode_2.pdfIn PDF document text
    • http://fimewovoko.getenjoyment.net/uses_and_abuses_of_mobile_phone_essay.pdfIn PDF document text
    • http://vomidujoma.scienceontheweb.net/are_bobbi_brown_brushes_worth_the_money.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/mipizaju/20517283033.pdfIn PDF document text
    • http://xikusaduxofi.atwebpages.com/rizonenarigo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccbbcfe6-ebdb-467c-9db9-478b5f5dc1af/madolelusogukadinu.pdfIn PDF document text
    • http://fiforeru.atwebpages.com/los_diarios_de_motocicleta_full_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbdc348b-4d11-4b67-910d-2d9985d6277c/samsung_un55ju6700_specs.pdfIn PDF document text
    • http://vepitejususas.atwebpages.com/binoxogoja.pdfIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/sketchup_3d_warehouse_free_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/sabegokek/lalitiwiziwedinude.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc374328-91b3-4575-8584-de3cd8796988/temple_of_seitan_mac_and_cheese_recipe.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_off0000d7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E9 5584 bytes
SHA-256: 85d1814f9c01b6207396fcf61744fa05c171793f7afcfe0d649f5252d9d4d004
font_01_sfnt_off0000eadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADB 11468 bytes
SHA-256: c6c9f3da96e00c15b23e12a9dc5b7689f76e161ceff0d3a9cd2929b547c8a39b

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