Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b3cd351d824d1f8…

MALICIOUS

PDF

73.1 KB Created: 2021-03-02 03:15:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 1031d9da6ac9dd5eccbc8dcf80b78f02 SHA-1: 74033cc40334733c2ab5feb30c281fd862867432 SHA-256: 8b3cd351d824d1f8c2272ffc798e4061ff76981f551e4fffdf602fefc773368e
166 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. The heuristic 'SE_REMOTE_SUPPORT_LURE' indicates the document likely instructs the user to install or connect with a remote-support tool, a common tactic for gaining unauthorized access. Multiple external URIs are present, suggesting the document is part of a larger distribution network aiming to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://pelibifir.ru/strik?utm_term=college+board+sat+book+2018+pdf PDF link annotation
    • http://worldhold.online/718250982919zocc.pdfIn PDF document text
    • https://cdn.sqhk.co/rotefuver/vdRije6/canon_print_inkjet_selphy_2._0_0_downloaden.pdfIn PDF document text
    • https://cdn.sqhk.co/mosugukasiba/jdMXhbV/word_of_the_day_list_for_preschoolers.pdfIn PDF document text
    • https://cdn.sqhk.co/menidume/DNhfi5K/19467864175.pdfIn PDF document text
    • http://igcopyrightverify.com/what_is_position_distance_and_displacement_in_physicsxvjjt.pdfIn PDF document text
    • http://guzexesuge.mypressonline.com/mensa_practice_test_results.pdfIn PDF document text
    • http://ruwemipuwev.mypressonline.com/33450486953.pdfIn PDF document text
    • https://cdn.sqhk.co/tomubozes/ghWjbIv/bopuwadiwazuk.pdfIn PDF document text
    • https://cdn.sqhk.co/loxusovi/khfzjl5/teamviewer_remote_control_android_tv.pdfIn PDF document text
    • https://cdn.sqhk.co/toxinize/iimYLji/73431559819.pdfIn PDF document text
    • https://cdn.sqhk.co/gokarunedod/g4zfFTJ/swordsmanship_definition_oxford_dictionary.pdfIn PDF document text
    • http://reawolt.online/denon_home_audio_equipmentaf686.pdfIn PDF document text
    • http://sifinujox.sportsontheweb.net/wafitakiwasikuwadibelek.pdfIn PDF document text
    • https://cdn.sqhk.co/feguzuvubut/egcifT6/semolivugelufokivazetakof.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fataragoreb.myartsonline.com/14987562348.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/2013_chevy_captiva_sport_manual.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_off0000deee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEE 5836 bytes
SHA-256: 405939c396da7e3bfd28c01f68c14b1ef87f3d2930541432fda349d0db05ab17
font_01_sfnt_off0000f2d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D7 10816 bytes
SHA-256: 220fffb406bf08b96fe68339b43e661d9b177e23cbff111aef23611372c77129

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