Malicious PDF — malware analysis report

Static analysis result for SHA-256 2297efa16bf6430a…

MALICIOUS

PDF

77.6 KB Created: 2021-03-16 09:57:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: a8e0bf8697e273278b8ada0b0d9f4ad1 SHA-1: 485afc1718c8f7a072ed8c974c28988489faf5ca SHA-256: 2297efa16bf6430ab3adea902339f934658b13b136eca0a070d8725cd49c2136
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to a domain associated with phishing lures ('bologen.ru'). Heuristics indicate this PDF is part of a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://bologen.ru/award?keyword=google+scholar+search+tips+pdf PDF link annotation
    • http://jujanaxuwiroki.iblogger.org/silence_by_shusaku_endo_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/ribovonubod/bjdhjhe/vimopo.pdfIn PDF document text
    • http://winelorasagi.22web.org/36586622374.pdfIn PDF document text
    • http://trelon.fun/fakuxifotosevikatigy39q.pdfIn PDF document text
    • http://wildboost.club/55282119245feqk1.pdfIn PDF document text
    • http://gatigade.iblogger.org/pugixufusewoxojonej.pdfIn PDF document text
    • http://memaviwebepa.22web.org/anticancer_drugs_mcqs.pdfIn PDF document text
    • http://xudogiborijum.66ghz.com/marriage_certificate_application_form_surat.pdfIn PDF document text
    • https://cdn.sqhk.co/basinasedu/azbUMz0/tuvefoj.pdfIn PDF document text
    • http://wuwulobuxalajut.iblogger.org/weber_grill_n_go_light_7661.pdfIn PDF document text
    • https://cdn.sqhk.co/zolewiko/Shagdhc/1625615837.pdfIn PDF document text
    • http://blubadgehelp.net/38232404905spqro.pdfIn PDF document text
    • http://legionmone.xyz/what_is_a_return_of_service_agreement31xvx.pdfIn PDF document text
    • https://cdn.sqhk.co/nenuguvan/okMUhdP/pro_name_generator_for_free_ffxiv.pdfIn PDF document text
    • https://cdn.sqhk.co/novigigexuxo/hhgdjhL/kontra_k_songs_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6cdaac2-9a23-4ab5-8f51-72e461a82cca/literaburaw.pdfIn PDF document text
    • http://zebigibozudival.epizy.com/rinusizavaseb.pdfIn PDF document text
    • http://robabunegulawi.rf.gd/kafokawopilimowes.pdfIn PDF document text
    • http://walefusariwe.epizy.com/shandaar_full_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c49947a-f8ba-41d4-b98f-da1bb3e78933/kindle_paperwhite_2013_user_manual.pdfIn PDF document text
    • http://xefavab.rf.gd/army_record_information_management_system.pdfIn PDF document text
    • http://rusuxagek.rf.gd/whatsapp_apk_ultima_version_mayo_2019.pdfIn PDF document text
    • http://melibeduzos.rf.gd/night_owl_wire_free_security_camera_system.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_off0000f0be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BE 5448 bytes
SHA-256: bfe65dd5bf4b1f77f0b438eb8a0df3902b02c92b6b5dc8118209dadeb65639bc
font_01_sfnt_off00010349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10349 10528 bytes
SHA-256: 51f9f806b0bb86c8d1b3c83740ea427cad111d89e1e687d97b63f3972fd3e295

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