Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed672cb190b450ed…

MALICIOUS

PDF

78.3 KB Created: 2021-03-20 00:54:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: dde54deefa68997ccf92000d8a277b3e SHA-1: 254851e4194bcf72636591b930d0735372047bc7 SHA-256: ed672cb190b450ed8190e7ede72ff9722b893bdac3669af6498c1f09f073eb16
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a primary focus on `https://vilenefex.ru/123?utm_term=ssc+chsl+2019+answer+key+release+date`. Heuristics indicate this PDF is a link farm hosted on disposable domains, and ClamAV detection confirms it as a phishing trojan. The ML classifier also strongly flagged it as malicious. No scripts were extracted, but the structure and URL distribution suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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/123?utm_term=ssc+chsl+2019+answer+key+release+date PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4468871/normal_5fe730406af9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475580/normal_6009d12bc4de1.pdfIn PDF document text
    • http://losmopaka.site/how_to_become_a_chartered_financial_analystmnzkm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479236/normal_602ea74d42247.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448129/normal_605524ca7b6f9.pdfIn PDF document text
    • http://kdghy.online/dapowufasizetagusoxzah63.pdfIn PDF document text
    • http://fsbsiod.com/rebuxosiroxixigadadadqbpjw.pdfIn PDF document text
    • http://lunotikipadul.66ghz.com/28681978509.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451930/normal_5ff5f01348940.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473947/normal_603ebd6f4ea35.pdfIn PDF document text
    • http://summ-green.fun/wilutuxugq70v3.pdfIn PDF document text
    • http://triple-doska5.club/dragon_ball_heroes_ultimate_mission_2_3ds_rom3478e.pdfIn PDF document text
    • http://meetlait.pro/beretta_92fs_vs_92_compact7j4tm.pdfIn PDF document text
    • http://cmbmarketing.agency/gopalogovuxuxjgr4.pdfIn PDF document text
    • http://comforfemj.fun/83361733408h1eq3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369645/normal_5fc869813e96c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380700/normal_6027e200e01d3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fokobawenola.epizy.com/37054448057.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/copper_sheet_metal_scrap.pdfIn PDF document text
    • http://natizat.epizy.com/have_has_had_worksheet.pdfIn PDF document text
    • http://nuxizutize.rf.gd/benuzi.pdfIn PDF document text
    • http://likawunudonanep.epizy.com/vocalise_rachmaninoff_cello.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/platformer_games_steam.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78A 5872 bytes
SHA-256: ed2a80edc4f61cf4f15b1f4dc2b7320f726d0042d92bcf06cbc78d13ff133b85
font_01_sfnt_off0000fb90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB90 1936 bytes
SHA-256: 7420db9ec41012b263dff8e0d039d2a895961a6b4c1647eabbcd20f441fad98a
font_02_sfnt_off000104d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D7 11312 bytes
SHA-256: f59273d87b94768cb19e5e01aa2d1d582983e8ac7fa276ae58d099b725c7584e

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