Malicious PDF — malware analysis report

Static analysis result for SHA-256 a57384fd63a54773…

MALICIOUS

PDF

67.5 KB Created: 2021-03-31 07:04:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: e90e800b2712e850212ef180acd9bb9f SHA-1: edbcf32776cd452eb6ee9a2a7eb4a26877334244 SHA-256: a57384fd63a547737fa26f5125c07b261820fc4c60453565d7d3d8030769ec16
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and is flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection. The document body, though partially corrupted, suggests a lure related to connecting a speaker, which redirects to a URL on 'vilenefex.ru'. This indicates a phishing or scam attempt designed to redirect users to potentially harmful content.

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://vilenefex.ru/aws?utm_term=how+to+hook+up+ihome+speaker+to+computer PDF link annotation
    • http://jonimowar.iblogger.org/healthy_blood_pressure_protocol.pdfIn PDF document text
    • http://gbo.guru/43361742804lh4bz.pdfIn PDF document text
    • http://1xbet-registrat.site/learn_autocad_2007_free_download2itne.pdfIn PDF document text
    • https://cdn.sqhk.co/dopuwene/f1jcS1s/download_mini_shooters_battleground_shooting_game.pdfIn PDF document text
    • http://lnstagramsupportinfo.com/795203286404l20b.pdfIn PDF document text
    • http://zevixoleg.iblogger.org/nudubi.pdfIn PDF document text
    • http://potozafit.medianewsonline.com/49371521224.pdfIn PDF document text
    • http://reduslimitalia-oficial.site/1089402364573pgu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zijipowatik.epizy.com/rigeloturozonilakakax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a9f5e4c-a6c6-4ddd-ab3d-18cd45113a87/how_much_oil_does_a_2002_ford_explorer_take.pdfIn PDF document text
    • http://redurafab.epizy.com/dutch_settlement_in_south_africa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fbff26c-b2c3-4d85-884f-f4ff7ab3e2a9/38023014084.pdfIn PDF document text
    • http://redepulevinevux.epizy.com/6994516579.pdfIn PDF document text
    • http://kusogit.rf.gd/crime_and_punishment_part_5_litcharts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4359fbfd-0cc2-4b20-872d-4ab701e13d2b/xufawetibeboxeduli.pdfIn PDF document text
    • http://rizivubonulej.atwebpages.com/kesevisujizexa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62d23aac-a5fa-4a89-b686-c1f1f4b2fc7e/sodastream_refill_cost_nz.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_off0000cc78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC78 5256 bytes
SHA-256: 158ec73b326e8205d78565e2b1d6ed8852dbb0b6693158bb81210ca1ee4ecb10
font_01_sfnt_off0000de3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3B 10160 bytes
SHA-256: a8cd07d31eeb52c4dc87fde738d24eafbcdb27693b80febdc44bb7a955f09f09

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