Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f4f9b2b2dd6c805…

MALICIOUS

PDF

75.4 KB Created: 2021-04-11 22:26:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 17ab8b28131b0ef9211582ecb135b1b9 SHA-1: 77e296e25b5a2d80dee1ee1b5b29a4a8b6260d8f SHA-256: 8f4f9b2b2dd6c805ab4dd42ed9f80d06842a9d8026aaa1fbdba8c1deb94710e0
126 Risk Score

Malware Insights

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

The ML classifier and ClamAV both strongly indicate maliciousness, with ClamAV identifying it as a phishing trojan. The PDF contains numerous external URIs, one of which, https://leonvi.ru/strik?utm_term=..., is flagged as a suspicious link farm. The document body is heavily obfuscated and appears to contain metadata rather than user-readable content, suggesting a malicious intent to obscure its true purpose. No scripts were extracted from this sample.

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://leonvi.ru/strik?utm_term=the+natural+rate+of+unemployment+results+when+cyclical+unemployment+is+equal+to+zero PDF link annotation
    • http://wulutano.mywebcommunity.org/similar_triangles_worksheet_kuta.pdfIn PDF document text
    • http://hempmap.ru/gebisaveg96x7r.pdfIn PDF document text
    • http://requiredjokblog.com/pomitekapoxkaoy.pdfIn PDF document text
    • http://artistichomesolutions.com/jarvan_guide_s8z2y89.pdfIn PDF document text
    • http://japadalifu.22web.org/materiales_dentales_barcelo_gratis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cfc603e6-7cd4-4c42-812b-9722deb80ae4.filesusr.com/ugd/0e9fc2_a2f23a71ba3049cd8b1a021abf292930.pdf?index=trueIn PDF document text
    • http://rexerikilo.epizy.com/microscopic_animals_harmed_by_excess_uv_answers.pdfIn PDF document text
    • https://9329dc78-1a6b-4cc7-98ac-1b36262b7dd5.filesusr.com/ugd/d2be55_9cdc5fa56751421188533c9a43a1ed96.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/57ca9588-d2da-4226-8a36-7ca9733275d0/2055531957.pdfIn PDF document text
    • http://nefamuvipejin.rf.gd/kijutilojon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e9f05cd-794f-4572-bf13-02f8d359470f/motagafigitenopi.pdfIn PDF document text
    • http://bamonoxo.onlinewebshop.net/2020_calendar_free.pdfIn PDF document text
    • https://9ef77391-fdd1-48d8-ba15-364b07375333.filesusr.com/ugd/ebefdf_d855bc1ce3b14735ab7b90e052a4a3cb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a59da453-3acb-4612-af9c-00185d321d20/jatanu.pdfIn PDF document text
    • https://36622f5a-5a1b-41a5-aa98-965156e47ac2.filesusr.com/ugd/804ff6_08d0415c57f74a1991a279209114ebb8.pdf?index=trueIn PDF document text
    • http://lujifub.epizy.com/rojadifosi.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_off0000e62e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62E 5572 bytes
SHA-256: 6dad29d484df6d58d039a28cb019ee27d147ec3314ef5938c42b516099aa17fa
font_01_sfnt_off0000f91a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91A 11320 bytes
SHA-256: 1c8e68d713969de7bc8764c75c45c9ecbda2fe9d81411aebda56b1dfb308bff7

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