Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c664fa59934b262…

MALICIOUS

PDF

99.4 KB Created: 2021-03-23 06:01:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 1419fed687cb6640b2b727508842289e SHA-1: a25d9307c109fec671d90dfe0e897f2566737471 SHA-256: 4c664fa59934b262a1120d2083e57104085477271a25f43434afeb7169459a1d
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URIs, with a primary focus on 'https://soxebez.ru/award?keyword=isoniazida+bula+pdf+anvisa'. Heuristics indicate this PDF is part of a link farm on disposable hosting, and ClamAV detected it as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0'. The ML classifier also flagged it as highly malicious. The presence of external URIs suggests an attempt to redirect the user to a malicious site, consistent with phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://soxebez.ru/award?keyword=isoniazida+bula+pdf+anvisa PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4498868/normal_5fdb0c0858fb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403952/normal_604fed3562035.pdfIn PDF document text
    • http://kakafeg.scienceontheweb.net/the_phases_of_the_moon_whats_going_on_worksheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495975/normal_6017fe9186413.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496389/normal_6024514b24ad9.pdfIn PDF document text
    • https://cdn.sqhk.co/sovanoniwuva/ejbgghh/36072976144.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409255/normal_5fd93817397a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469852/normal_5fe7d42d4f226.pdfIn PDF document text
    • https://cdn.sqhk.co/jagapifa/aKicpge/8797557608.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452839/normal_6038cf2937062.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488555/normal_60548afaecaf6.pdfIn PDF document text
    • https://cdn.sqhk.co/lixetajetevu/OjeBThi/73989719270.pdfIn PDF document text
    • http://povisowalikim.scienceontheweb.net/87425979625.pdfIn PDF document text
    • https://cdn.sqhk.co/zeritogekuja/hjo2239/zaxanuvonuvupolefanid.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/kavalukato/wurogidinidogobov.pdfIn PDF document text
    • http://dupopat.epizy.com/how_to_read_a_star_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/best_fighting_techniques_for_street_fighting.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/ritidawanazijabugova.pdfIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/2005_chevy_malibu_maxx_ls_v6.pdfIn PDF document text
    • http://kenubuw.epizy.com/cyberlife_first_android.pdfIn PDF document text
    • http://vujapoguxesak.myartsonline.com/barbara_minto_pyramid_principle.pdfIn PDF document text
    • https://s3.amazonaws.com/libusamagowuvo/football_manager_2015_download_completo_portugues_pc_gratis.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_off00013643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13643 4812 bytes
SHA-256: 354d201c1d39409870a0008b37665099615b8ef7f899bc701ab6abc7fbb65ffc
font_01_sfnt_off0001469f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1469F 14536 bytes
SHA-256: 0acd0dda0402c92ccbf61d1f3c777b1e68208095d5d26b9141d424590f745d45
font_02_sfnt_off0001708c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1708C 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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