Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c5f0bc384e7b5e0…

MALICIOUS

PDF

92.8 KB Created: 2021-03-04 01:57:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: e9dd68eb7166662df34aed5ffe78e809 SHA-1: f06f14c7f81ce7dca361784c51569fd90e2134ef SHA-256: 8c5f0bc384e7b5e0708de9f6cb8d5e485355c0b14a262e789bd65f6ef0d363fa
126 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains keywords related to Dell drivers, indicating a lure for users seeking specific hardware drivers. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

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://zajinet.ru/award?keyword=dell+optiplex+790+lan+drivers+windows+7 PDF link annotation
    • http://idealsit.space/graduate_mechanical_engineer_jobs_melbournetg84a.pdfIn PDF document text
    • http://badge-verification-center.com/3546104157785rjs.pdfIn PDF document text
    • http://tosety.xyz/mario_bunge_epistemologia_librofe4va.pdfIn PDF document text
    • http://motarojetox.sportsontheweb.net/jaxizuvubaw.pdfIn PDF document text
    • http://pofaduxiruk.getenjoyment.net/what_is_the_geometry_of_a_carbonyl_group.pdfIn PDF document text
    • http://gebuhrenfrei-mein.com/metformin_dosage_pcosdq0l0.pdfIn PDF document text
    • http://lnstagramcopyrightservices.org/89632878279r9w0r.pdfIn PDF document text
    • http://italiabeach.space/629197541548lzg8.pdfIn PDF document text
    • http://gedagefi.22web.org/blackpool_nhs_trust_cqc_report.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://numumodi.epizy.com/apostrophes_for_possession_worksheet.pdfIn PDF document text
    • http://safipalibeso.rf.gd/wupuxumazikofakurexo.pdfIn PDF document text
    • http://tuninedup.epizy.com/16306135067.pdfIn PDF document text
    • http://feferabi.atwebpages.com/baxi_luna_3_comfort_310_fi_error_codes.pdfIn PDF document text
    • http://wulimazef.epizy.com/ben_10_games_free_for_pc.pdfIn PDF document text
    • http://fowevazi.rf.gd/sportdog_training_collar_charging.pdfIn PDF document text
    • http://rijogutigoxek.epizy.com/52659736386.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_off0001223f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1223F 5552 bytes
SHA-256: 3a395a827e46039759f76ac770daa949d92fd22de2e842bba490c957bd0057de
font_01_sfnt_off0001354e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1354E 15732 bytes
SHA-256: ee6963a9b0e191b6bbc2da8d651a5be97fbbd42bf442ab99d568ac047f02e4c4

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