Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f66855f8295ffc1…

MALICIOUS

PDF

94.8 KB Created: 2021-03-10 06:02:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: df2de0155f7f26147c39fd257c912a6f SHA-1: a93fabcc38c1bf9027355bf139add0427a2aed1e SHA-256: 8f66855f8295ffc18033a9985c7df31a4c8c9d85bb11431c6597455900b49c6c
96 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with a high risk score. It contains an embedded URI pointing to a suspicious domain, vilenefex.ru, which is likely used to host a malicious payload or phishing content. The document body, though heavily obfuscated, suggests a lure related to 'resource capture'. No scripts were extracted, but the presence of external URLs and the nature of the detection suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/123?utm_term=projeto+capta%25C3%25A7%25C3%25A3o+de+recursos+pdf PDF link annotation
    • http://betizekaxu.getenjoyment.net/pride_go_go_elite_scooter_price.pdfIn PDF document text
    • https://cdn.sqhk.co/gudopokobipa/jwjejhE/best_color_changing_rope_lights_for_bedroom.pdfIn PDF document text
    • https://cdn.sqhk.co/koxajavu/hh1bFif/parkour_seeds_for_minecraft_pe.pdfIn PDF document text
    • https://cdn.sqhk.co/fegibowaxus/gj6ibhf/parler_app_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/rekubapapup/byJhfK7/gadakipuzukowezuvano.pdfIn PDF document text
    • http://mamimufexaliro.66ghz.com/700472486.pdfIn PDF document text
    • http://fisareboveda.getenjoyment.net/zapuxozesagorawipi.pdfIn PDF document text
    • http://pozezan.mygamesonline.org/alan_watts_this_is_it.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/foneniz/27822604502.pdfIn PDF document text
    • https://s3.amazonaws.com/mozirolinitaje/utagoe_acapella_making_software.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/indian_promissory_note.pdfIn PDF document text
    • http://xonekalanalu.epizy.com/sql_server_development_tools_2012.pdfIn PDF document text
    • https://s3.amazonaws.com/geraromu/dojojuvulogusoxefu.pdfIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/timesheet_calculator_with_lunch_breaks.pdfIn PDF document text
    • https://s3.amazonaws.com/jefobexapulow/liver_cirrhosis_treatment.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/constitutional_convention_conflicts_and_compromises_worksheet_answers.pdfIn PDF document text
    • http://vedagavizevuwu.rf.gd/39060146464.pdfIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/46387415091.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/rajutivixuzonep.pdfIn PDF document text
    • http://gujuwaxewogo.epizy.com/assassination_rogue_7._1._5_pve_guide.pdfIn PDF document text
    • http://filoroxesofe.rf.gd/86722065534.pdfIn PDF document text
    • https://s3.amazonaws.com/jejulurowev/sanyo_tv_codes_for_rca_universal_remote.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/affirmative_form_of_verb.pdfIn PDF document text
    • https://s3.amazonaws.com/tufitijinexu/79218240686.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_off00013185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13185 5696 bytes
SHA-256: f9958f4aa638e235143af626d6c8ea4ad97fbc5af21f11c4337168c0bd7c01ec
font_01_sfnt_off0001441d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1441D 13116 bytes
SHA-256: 476898ad9bcfedf13d09c82a318763740750ce8b0fbff83ed4f76fb00951f9f7

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