Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c932d874184b57e…

MALICIOUS

PDF

68.8 KB Created: 2021-02-16 19:40:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: d3141bbaf24793b840cb157ae42c6ed0 SHA-1: 400d9aaaa3a2343db2265a3249a49f11419ca0e3 SHA-256: 7c932d874184b57e947a343935ed0aa68c85e7c36cf7ce1e93b4e32cff52f7ab
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and the ML classification strongly indicate a phishing or malware distribution attempt.

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://bologen.ru/123?utm_term=bosch+axxis+washer+adding+detergent PDF link annotation
    • https://cdn.sqhk.co/momujolo/ZJjaMgg/ordinal_data_analysis_methods.pdfIn PDF document text
    • http://masajsalonunuz.com/tizexelonijuwcwvj.pdfIn PDF document text
    • http://studytogether.fun/27143244511svtm7.pdfIn PDF document text
    • http://sokadap.22web.org/tri_fold_brochure_background_free.pdfIn PDF document text
    • http://rekopeza.22web.org/bluestacks_offline_installer_filehippo.pdfIn PDF document text
    • https://cdn.sqhk.co/fekigimuzib/d8Yighd/the_happiness_planner_printables.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496602/normal_6000588c76c2e.pdfIn PDF document text
    • http://henrysavbr.site/las_vegas_to_grand_canyon_bus_tours_dealsjly67.pdfIn PDF document text
    • http://cpskras.website/bensalem_police_accident_reports33qq1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449009/normal_5ffebfd3c4427.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419654/normal_5ff96dbfe5bd5.pdfIn PDF document text
    • https://cdn.sqhk.co/puburikob/KJicLGW/duxofamifikukagotu.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/vezumobigodub/xinidoma.pdfIn PDF document text
    • http://pakekaririwofas.rf.gd/excel_year_planner_template_2019.pdfIn PDF document text
    • http://bukinajomo.epizy.com/stock_market_crash_definition_example.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/fipadopevuwozabapajawin.pdfIn PDF document text
    • http://totiwofosu.epizy.com/leveling_guide_wow_classic_warlock.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_off0000cf46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF46 5376 bytes
SHA-256: 790600eafda891e4e6b38ca2a362e723a19e79e7907ae171ff2e53cc45e24934
font_01_sfnt_off0000e1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A7 10728 bytes
SHA-256: baec74c7e38d533f605541acb42b630b319b5edf70069a7566ebfdc11c096e9f

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