Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d4bfd6576227fa2…

MALICIOUS

PDF

78.5 KB Created: 2021-04-22 17:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: e7c5010b8a319e5c70e3521b06f2dbe3 SHA-1: 985e701e7c086aa20616a0021c6035ac513f4449 SHA-256: 9d4bfd6576227fa2f41db9c5fdc68ea494bcb9a62c96a51a71c54c0f0b146b04
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ClamAV as a phishing trojan. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm strategy, and the ML classifier strongly suggests malicious intent. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a potential lure related to a book synopsis, aligning with phishing or malware distribution tactics.

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://dugedepap.ru/strik?utm_term=night+shift+stephen+king+synopsis PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501193/normal_603d72900ec89.pdfIn PDF document text
    • http://kavelizopepi.mywebcommunity.org/pagezajovodip.pdfIn PDF document text
    • http://freehookup.xyz/dusajasimsx3ft.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451348/normal_602748abec0f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368228/normal_6054b4a93697a.pdfIn PDF document text
    • http://devivitonewe.sportsontheweb.net/jejupek.pdfIn PDF document text
    • https://cdn.sqhk.co/ratevusur/jPEhbjb/75758708285.pdfIn PDF document text
    • https://cdn.sqhk.co/merojuniv/ihclXgi/69886109600.pdfIn PDF document text
    • http://rasudilikid.mywebcommunity.org/expert_c_programming_deep_c_secrets_by_peter_v._linden.pdfIn PDF document text
    • http://ruvenebigolusep.mywebcommunity.org/bhagavad_gita_in_tamil_chapter_18.pdfIn PDF document text
    • https://cdn.sqhk.co/kokojisip/jFgdjTJ/46500495075.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393641/normal_601a0a42bb53c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384470/normal_5ffe0c213b56c.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.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/32d804fb-b50a-403b-806e-2c12c2c257a7/riwotuseruribo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca56790c-9e2c-4c9a-bf7b-53a54755a261/xaweroxutobabof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f74c2cf-c414-4408-ab01-932f164436cc/dan_brown_inferno_movie_ending.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_off0000f509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF509 4960 bytes
SHA-256: c0c6fbd4191a3a35396b1072dcfd2ad44a2f4f96f0a015accc9e1fd6738e1e00
font_01_sfnt_off00010608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10608 11448 bytes
SHA-256: 066a853c503b88e0dc79795d35a7133a8247f374ebe644884fb2b225a0953ad6

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