Malicious PDF — malware analysis report

Static analysis result for SHA-256 41083e8e903f3cc5…

MALICIOUS

PDF

71.8 KB Created: 2021-02-03 10:17:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: ddd9c1ea6f3f8f86dad2b3b2c5b6222f SHA-1: 1c0affe0ab7a7b4da3ee957aa0835f9c3e13aa8a SHA-256: 41083e8e903f3cc5548368686dd5aa0c770568bb119f4a125e6fef4bc754d0c8
126 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=wow+tbc+trial+of+the+sea+lion PDF link annotation
    • https://cdn.sqhk.co/zobelekivix/rjhVbGb/lands_in_world_of_warcraft.pdfIn PDF document text
    • https://cdn.sqhk.co/xavonepez/ocjeii0/hockey_statistics_website.pdfIn PDF document text
    • http://help-service-support.com/welom8m8l8.pdfIn PDF document text
    • https://cdn.sqhk.co/bepemuno/ThiFU7v/cartoon_wars_3_hacked_apk_for_android.pdfIn PDF document text
    • http://tranquils.space/bdd_excel_templateuv3a5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388824/normal_5febcf4ea4629.pdfIn PDF document text
    • https://cdn.sqhk.co/jimumakevaji/j5a6ih5/50053507213.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405193/normal_5fd915a35416f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476569/normal_5fe7beedd1505.pdfIn PDF document text
    • http://experiment.website/cheats_de_doom_2_gba57jma.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393502/normal_600bc21f0d7a3.pdfIn PDF document text
    • http://enots.space/maryland_pesticide_core_manualqz7e6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419847/normal_5fca7caa1a882.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/didowugorokirug/nfl_team_depth_chart_cheat_sheets.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_off0000de40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE40 5212 bytes
SHA-256: d679b13a0c11aa4d42747d245f0b289f8124777f29597d6989b43307fe189ad0
font_01_sfnt_off0000f010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF010 10164 bytes
SHA-256: 52b86c61f45955d7be78c519d428e47880d5d2037a9caeb9bb24abbb271e08a2

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