Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a8d85f2497b93fb…

MALICIOUS

PDF

70.8 KB Created: 2021-04-02 18:26:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 858819167aab22b897f2593e76bc1747 SHA-1: 0d1bce6da0fc6948745fd95d19867707c00e8261 SHA-256: 0a8d85f2497b93fb62adeacdc7037e837ac2810a2915764f312c172442df7740
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain associated with a link farm. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware delivery. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the classification as a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/strik?utm_term=summer+waves+sfx1000+sfx1500+filtration+pool+pump PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4482854/normal_6064a6f22f0dd.pdfIn PDF document text
    • http://xapunubezes.iblogger.org/catalasa_en_alimentos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414169/normal_6062b6edca62b.pdfIn PDF document text
    • https://lakupofudeb.weebly.com/uploads/1/3/0/7/130775354/jiriwekesimu.pdfIn PDF document text
    • https://pesawuzopedeg.weebly.com/uploads/1/3/5/3/135327269/fd5cf97e6925191.pdfIn PDF document text
    • http://lalabomujulimof.mywebcommunity.org/diferencias_entre_capitalismo_y_socialismo.pdfIn PDF document text
    • http://kurewegunopef.66ghz.com/50150494554.pdfIn PDF document text
    • http://tejidirexe.mywebcommunity.org/5635802123.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414869/normal_600ff1785358c.pdfIn PDF document text
    • https://tosofeguwus.weebly.com/uploads/1/3/4/3/134321705/dumid.pdfIn PDF document text
    • http://vanibunogi.iblogger.org/vogezijum.pdfIn PDF document text
    • https://vomodubezu.weebly.com/uploads/1/3/5/3/135398809/4158328.pdfIn PDF document text
    • http://nosatines.mypressonline.com/actionable_gamification.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://povasapodojika.epizy.com/on_my_way_song_pagalworld.pdfIn PDF document text
    • http://wemaxoseni.myartsonline.com/bsqueda_y_recuperacin_de_la_informacin.pdfIn PDF document text
    • https://s3.amazonaws.com/rurovikejigibu/6349448297.pdfIn PDF document text
    • https://s3.amazonaws.com/mokamoba/lajelisoxevivad.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/fapibajutazomolatelizumed.pdfIn PDF document text
    • http://gugosezufuted.epizy.com/action_verbs_flashcards.pdfIn PDF document text
    • http://xesijapapun.rf.gd/indoor_conditioning_drills_for_soccer.pdfIn PDF document text
    • http://banitazivi.epizy.com/endocrine_system_hormones_worksheet.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_off0000d3d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D2 5688 bytes
SHA-256: 23b02690c5ed970f2fc364bce0d35504f9d454d4b7b63e5e478819326e22e7b5
font_01_sfnt_off0000e736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE736 11468 bytes
SHA-256: bcfbd813b21e337af3853fdb9397fd1ccc46b3c5bf3a1092ef175582f215c455

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