Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2fe465766d7baed…

MALICIOUS

PDF

76.6 KB Created: 2021-03-15 15:04:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 28f58b33300e49f799434f0aad863156 SHA-1: 6ad8f39cc72d53aea8bd5d27b5530d3de0e763ef SHA-256: c2fe465766d7baede56ee32419f47e1ac462c1a9de94c99e420e96ac15dc9936
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV and an ML classifier as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'pelibifir.ru' which is associated with a lure for a 'Struts framework book pdf'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a malicious intent to redirect users. Although no scripts were explicitly extracted, the nature of the heuristics and the embedded URLs strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://pelibifir.ru/award?keyword=struts+framework+book+pdf PDF link annotation
    • http://vuvajujuli.mygamesonline.org/bursas_de_la_rodilla.pdfIn PDF document text
    • http://tepugorotewole.medianewsonline.com/34541733883.pdfIn PDF document text
    • http://bafakuvim.sportsontheweb.net/define_police_intelligence.pdfIn PDF document text
    • https://cdn.sqhk.co/mitebosareki/JjjdCgd/11202301277.pdfIn PDF document text
    • http://wopexobow.mywebcommunity.org/30366884581.pdfIn PDF document text
    • https://cdn.sqhk.co/mujexoxa/agfFagh/arcade_hoops_game.pdfIn PDF document text
    • http://mateguwokalidub.getenjoyment.net/591960.pdfIn PDF document text
    • http://sevoxotedeki.medianewsonline.com/44564339450.pdfIn PDF document text
    • http://xibiselid.medianewsonline.com/what_are_the_three_different_types_of_audiences_rhetoricians_look_at.pdfIn PDF document text
    • http://zitupow.medianewsonline.com/bilutukatagitogagezodos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dejogamolefip.rf.gd/46138658381.pdfIn PDF document text
    • http://pelebirepopo.onlinewebshop.net/matibabodinakanemovej.pdfIn PDF document text
    • http://wilurimidolajej.rf.gd/jesus_bleibet_meine_freude_piano_sheet.pdfIn PDF document text
    • http://tiluxusimutine.atwebpages.com/nomifarifasikozexuno.pdfIn PDF document text
    • https://s3.amazonaws.com/luworizesupox/bigifugasizotadosuwexibor.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/pemosabira.pdfIn PDF document text
    • https://s3.amazonaws.com/tonisefoteka/22334299692.pdfIn PDF document text
    • https://s3.amazonaws.com/bipovoromoj/learning_bayesian_networks_neapolitan.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_off0000eae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE3 5556 bytes
SHA-256: 8d620a14662ad51d0f18c113a0abc2325de97db8d71649e7f498ab2d3ccb0068
font_01_sfnt_off0000fdbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBD 11264 bytes
SHA-256: ca9ac7aac6b44d33938269b0f9fe004d6a3049fb6ee868de11a6ef563a9e3294

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