Malicious PDF — malware analysis report

Static analysis result for SHA-256 700ab43e778e3f96…

MALICIOUS

PDF

67.2 KB Created: 2021-03-19 09:39:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6229c9f21ae7f6d81fd312e72ccf11fa SHA-1: 8e7d9cd9aa70191a851d8453574e4590db269b78 SHA-256: 700ab43e778e3f96c9b47170c408781cee3c69c01d747fb99c4a539cd9d0eefe
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The presence of a URL pointing to 'pelibifir.ru' with a 'utm_term' parameter suggests a targeted lure, likely to distribute further malicious content or conduct phishing.

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://pelibifir.ru/123?utm_term=android+studio+open+browser+intent PDF link annotation
    • http://devuweza.scienceontheweb.net/85797229299.pdfIn PDF document text
    • http://nunesop.scienceontheweb.net/west_side_story_america_sheet_music.pdfIn PDF document text
    • http://lagimuzovixur.iblogger.org/adverbios_en_ingles_lista.pdfIn PDF document text
    • http://poxumanavofeboz.scienceontheweb.net/55792646325.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f7927488-8152-43cb-a667-e231f58cc5c5.filesusr.com/ugd/950cc9_bce5f77d6fe046b08f3d6d08b345759a.pdf?index=trueIn PDF document text
    • http://gawevoniko.rf.gd/programacion_neurolinguistica_para_aprender_ingles.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/78842328931.pdfIn PDF document text
    • https://s3.amazonaws.com/datarofapakil/banana_nutrition_information_health_benefits.pdfIn PDF document text
    • http://rivuwasiwitovud.rf.gd/155285186.pdfIn PDF document text
    • http://xarugutivi.epizy.com/customs_clearance_procedures.pdfIn PDF document text
    • https://bf23b77b-49a9-4bef-a898-a03cfb94aefa.filesusr.com/ugd/134172_fe8ffdbe990e4d84a974b2647afea32d.pdf?index=trueIn PDF document text
    • http://pikubub.onlinewebshop.net/ti_30xa_scientific_calculator.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/brother_mfc-_l2700dw_printer_linux_drivers.pdfIn PDF document text
    • http://tivurazug.rf.gd/angielski_gramatyka_czasy.pdfIn PDF document text
    • https://e8b83640-91e4-44a0-a69f-c2468797902f.filesusr.com/ugd/ee4a13_ba329fb3b9844e4586d01b6b9a9a10f8.pdf?index=trueIn PDF document text
    • http://waxukoke.epizy.com/kogovijew.pdfIn PDF document text
    • http://jifimurosesapu.atwebpages.com/bixunidazeza.pdfIn PDF document text
    • https://5c817321-7c0c-448b-959d-deb1da9fd788.filesusr.com/ugd/19103d_aceccb5752904445bd87b675906b304c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/bunotixalotese.pdfIn PDF document text
    • http://walakokuj.epizy.com/tweak_cydia_video.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_off0000ca03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA03 4932 bytes
SHA-256: ded032678b8bc7788557fa064db6e6e95b3c85bfa26986be5c1da4e898829c37
font_01_sfnt_off0000dae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE3 10540 bytes
SHA-256: a4bcdc80973d9b47087d4880ad241734f4608c6dd4d0cf7af0778b10664ecf59

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