Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0c0f4ec84f1ceb9…

MALICIOUS

PDF

81.7 KB Created: 2021-03-03 05:57:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 94ce8304d66959e960008fec580c3464 SHA-1: deeea8f692e3e39129b14a0811534d41eab2e9f4 SHA-256: b0c0f4ec84f1ceb9a29ed9b552c2233c402d05aa02e76051f7f6e6a60adb4bcb
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URLs, including one pointing to 'vilenefex.ru', suggests it's designed to redirect users to potentially harmful sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a link farm on disposable hosting, commonly used for phishing or malware distribution. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/123?utm_term=lowrance+x-4+pro+manuale+italiano PDF link annotation
    • https://pedesidava.weebly.com/uploads/1/3/4/3/134355179/60f49ba4.pdfIn PDF document text
    • https://rekepepijo.weebly.com/uploads/1/3/4/0/134018016/kodixilapa.pdfIn PDF document text
    • http://lazujifoxupa.getenjoyment.net/the_power_of_prayer_sermon_illustration.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405194/normal_5fde1588e631c.pdfIn PDF document text
    • https://cdn.sqhk.co/tifobebe/ihbiihc/wingsuit_simulator_sky_flying_gameplay.pdfIn PDF document text
    • https://libepuve.weebly.com/uploads/1/3/1/4/131407284/4815960.pdfIn PDF document text
    • https://cdn.sqhk.co/rekutadis/jiq5usc/17865093130.pdfIn PDF document text
    • https://puwevifu.weebly.com/uploads/1/3/4/4/134465284/mozuxuda.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://duzujijola.epizy.com/somabipaparut.pdfIn PDF document text
    • http://lawaxisagiwog.atwebpages.com/nofiletepononexud.pdfIn PDF document text
    • http://fatafebegit.epizy.com/zojedipojim.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F7 5004 bytes
SHA-256: ca6780113eb0bab7b8e01c1fd76c375b1f449975becd318f8e004a5e06130acd
font_01_sfnt_off000103fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FA 11324 bytes
SHA-256: 82ba9fe06ef2e74205fa93c4d5804a8aa228efa751a0d1545a8a4877c5d4ff48
font_02_sfnt_off00012a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A50 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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