Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bdfc22bdc09b610…

MALICIOUS

PDF

83.2 KB Created: 2021-02-28 03:47:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 1cbf96fa1e0107ba7349f38420a2ab3e SHA-1: cc93e2722bd6aace27a85f56a1be1ce10087ba28 SHA-256: 2bdfc22bdc09b6106607374fdc41e143ef684ef02cd608e1849d9330491ee201
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection scheme to host malicious content. The presence of external URIs and the 'link farm' heuristic indicate an attempt to direct users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/strik?utm_term=english+conversation+dialogues+in+office PDF link annotation
    • http://reduslim-ordina.site/45015148888vyy5l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419204/normal_6033d25e53316.pdfIn PDF document text
    • https://cdn.sqhk.co/rezeribevi/chckzhg/virtual_orchestra_studio_vos_piano_game_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368221/normal_5fd650118e149.pdfIn PDF document text
    • http://stroiline74.ru/rewapozorisumorivinjbfw.pdfIn PDF document text
    • https://bosaralox.weebly.com/uploads/1/3/4/6/134608385/d9dcd886d1.pdfIn PDF document text
    • http://naturapple.space/84489999951at6n6.pdfIn PDF document text
    • http://euroshopmn.space/39120296073cbutk.pdfIn PDF document text
    • https://wegakerovosa.weebly.com/uploads/1/3/0/8/130873826/1790612.pdfIn PDF document text
    • https://wivoximuvekobug.weebly.com/uploads/1/3/4/4/134473281/gokujetenepu_bemirematozobi.pdfIn PDF document text
    • https://cdn.sqhk.co/pizililiv/ngjigdd/fuse_voltage_drop_chart.pdfIn PDF document text
    • http://smartradiobf.ru/can_i_run_kali_linux_on_raspberry_piqqw2b.pdfIn PDF document text
    • https://cdn.sqhk.co/legikowe/hfWifih/94322233688.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zupenafud/africa_toto_choir_sheet_music_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/tajalamase.pdfIn PDF document text
    • https://s3.amazonaws.com/zukogi/dogalugolexukeranan.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_off00010967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10967 5300 bytes
SHA-256: 4732b1fc3669fe0cb52df37f26479ec8191b6bac90c115922912bc783b936181
font_01_sfnt_off00011b78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B78 10668 bytes
SHA-256: 9a04bcc696e40a51878573adbc4047b73ba67aa8bc1093af3ab4cd7bef99190f

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