Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4b6688722d10796…

MALICIOUS

PDF

74.4 KB Created: 2021-04-30 03:40:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 46a8ccc5cd82a8cdea3d1756406a3e61 SHA-1: ee3a5b437bfca44df1fa852a52c156557193592b SHA-256: e4b6688722d107969ebe0ba4e099dac3c7870680f7cb2d25d1720e28c32dfb7b
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to printer drivers, and the embedded URLs point to disposable hosting, indicating a phishing or malware distribution attempt. The presence of multiple distinct hosts and links suggests a link farm designed to redirect users to malicious 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/strik?utm_term=hp+laserjet+pro+400+color+m451dn+driver+windows+xp
    • http://zukoretevir.medianewsonline.com/poluduzusajezi.pdf
    • http://storezone.info/946191976717yxty.pdf
    • http://zekifafeter.scienceontheweb.net/hartley_oscillator_circuit.pdf
    • http://dimozakebaba.scienceontheweb.net/fepekutifalugepigidomifiv.pdf
    • http://sparzha.club/75657025339wnitj.pdf
    • http://tricitysikhs.com/sirowipuw6cfz.pdf
    • http://shtangelkipokupkiitd.online/74055602604us5kd.pdf
    • http://hackins.site/metodo_global_contabilidad_ejercicios_resueltosbwr5m.pdf
    • http://molotkov.site/detukifojasujogemeditaralqbsfv.pdf
    • https://cdn.sqhk.co/wupofolizaj/jjaiiha/99194234878.pdf
    • http://bitcoinov.site/noco_genius_g3500_car_battery_charger4ygrq.pdf
    • https://cdn.sqhk.co/kibutonap/jchb84I/fipimixaniz.pdf
    • http://garderob-podolsk.ru/8126846611996tr3.pdf
    • http://idealsit.fun/pharmaceutical_calculations_15th_edition_anselh79b6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sajomapujozokux.onlinewebshop.net/98904089385.pdf
    • https://s3.amazonaws.com/semuxemakaw/capture_one_portrait_styles.pdf
    • https://s3.amazonaws.com/minegikukovel/degunerutor.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e445.bin
a6a409184027edc12943b2b29f291a296a0570b366d30121df849f413e0a77c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE445 5884 bytes
font_01_sfnt_off0000f858.bin
86c28ce36b8f9c5b5996c45ed2158ac6c7ab55a1be9b75d007a75121ace134f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF858 10580 bytes

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