Malicious PDF — malware analysis report

Static analysis result for SHA-256 88a165b296724458…

MALICIOUS

PDF

70.8 KB Created: 2021-02-22 18:45:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: ef4f626b8447acb777ec80da9c62c00c SHA-1: cfcc40f51917a24200da56be7a3d453e7a2a5953 SHA-256: 88a165b29672445809aea2db02c8d1196bdc64c18cb2a0062671179ab65f31f7
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are associated with link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a lure to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/123?utm_term=wacom+intuos+pro+medium+pth-651-enes PDF link annotation
    • https://cdn.sqhk.co/gijimexuv/oy11Zjf/senoralitegulinakerekew.pdfIn PDF document text
    • http://appletopshop.ru/99322318748hzz4s.pdfIn PDF document text
    • http://pek-24.cc/970736590056yuxa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392661/normal_5fd0defdeb92d.pdfIn PDF document text
    • http://andyhongdigital.com/below_her_mouth_freee3hzc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383147/normal_5ff32780033b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414678/normal_5fe90f060b1b9.pdfIn PDF document text
    • https://cdn.sqhk.co/jawutuwek/fKIDghG/44884126060.pdfIn PDF document text
    • http://sdorovie-sustavi.xyz/fejalujalepor9p70.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469836/normal_5fef9c5777a55.pdfIn PDF document text
    • https://cdn.sqhk.co/runenuti/gCQjfY8/influence_the_psychology_of_persuasion_revised_edition_ebook.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384160/normal_600672c235eaa.pdfIn PDF document text
    • http://hookup154.space/filosofia_do_sucesso_napoleon_hillg362e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tibibexubedumu.rf.gd/60283575037.pdfIn PDF document text
    • http://malogamezomido.rf.gd/active_and_passive_voice_interrogative_sentences_exercises_with_answers.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_off0000d4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CF 5656 bytes
SHA-256: 6d90ebcd0fdad27584293143fb7df38d11454a2636b4ef592f2e3cbc96eb6e44
font_01_sfnt_off0000e7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F7 11268 bytes
SHA-256: 3bc00d13c5cadb3a90cec252281b1139c6ad5a2cdcdb7da82df3f8bbb55d142a

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