Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3686428b148fcf1…

MALICIOUS

PDF

80.9 KB Created: 2021-03-05 21:41:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 66bc4491231809e1c4b43942a3bfedae SHA-1: 52915c19e06577347ec52ef799a545a760e1234a SHA-256: c3686428b148fcf171cf3aa239093c92e627563d31d9f2f6271717de74fd965a
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains heuristics indicating it's a link farm and uses urgency lures. Crucially, it instructs the user to copy and paste content into a shell, a common tactic for executing malicious commands. Several external URLs were extracted, with some hosted on disposable domains, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://kuzutuzo.ru/award?keyword=how+to+get+a+better+rap+voice PDF link annotation
    • http://cookwellbakewell.com/zopaluwipifiziu7gqo.pdfIn PDF document text
    • https://cdn.sqhk.co/nifodotiriru/gZ3ggic/98275111002.pdfIn PDF document text
    • http://rastet-malysh.ru/diagnostico_de_enfermeria_en_trombosis_venosa_profunda6e6q5.pdfIn PDF document text
    • https://cdn.sqhk.co/mumeriretepi/iighieX/28989307985.pdfIn PDF document text
    • http://copyright-help-report.com/trkiye_klinikleri_journal_of_case_reportsnogvp.pdfIn PDF document text
    • http://axacheat4.xyz/map_skills_intermediate_directions_worksheets5s4to.pdfIn PDF document text
    • https://cdn.sqhk.co/rurufimibiwe/gyPL8HN/free_chinese_checkers_board_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/pelopuxi/qmghIhj/81287998384.pdfIn PDF document text
    • http://keribek.22web.org/rafime.pdfIn PDF document text
    • http://7lessons.website/how_do_i_reset_my_bose_cinemate_remote84gds.pdfIn PDF document text
    • http://fizovovapoz.iblogger.org/wolatepubifilazibazofo.pdfIn PDF document text
    • https://cdn.sqhk.co/loganidob/jagfjiN/8637583156.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/4f428c96-6143-4bec-ab1b-b73899b78054/voxodulelifire.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa0824e4-4f7f-4212-9f2d-0886c53cfe5b/how_much_does_a_coleman_pop_up_camper_weight.pdfIn PDF document text
    • http://gatinilub.epizy.com/30949340917.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27f9edbc-9882-4060-b2a2-0a39d0ab39f7/how_much_are_swiffer_wet_jet_at_walmart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f43fd21b-b87b-482d-b14a-4fc640c741d4/94669152183.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3db7514-8d55-4ac9-8ce6-3f24fcece1be/65539293446.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/936142fd-bbad-4aeb-bcc9-01c94cb24610/xavuxuxiti.pdfIn PDF document text
    • http://pimifemegizak.epizy.com/96428963099.pdfIn PDF document text
    • http://xuletuma.epizy.com/durinate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15a896a4-d981-4da8-a74a-6a250878a71a/27823695347.pdfIn PDF document text
    • http://juwemijawikipo.epizy.com/burger_king_menu_breakfast_deals.pdfIn PDF document text
    • http://nigowona.rf.gd/67056200957.pdfIn PDF document text
    • http://nopuzowisaw.rf.gd/cdri_full_form.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B1 4824 bytes
SHA-256: 47eda2a594fe7b54877d4a5c15268b22ec0d2d7b723915175075281dc3d59af4
font_01_sfnt_off0001014d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014D 10980 bytes
SHA-256: b0aceb5a18e47c8796c7bf08d5d54e718bd6d065a41039623320c5534b005c86
font_02_sfnt_off00012680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12680 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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