Malicious PDF — malware analysis report

Static analysis result for SHA-256 08dec6c52e1b1299…

MALICIOUS

PDF

121.5 KB Created: 2021-03-16 23:12:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13a0b346445730b13846966cf5736dfb SHA-1: 3043ab4be1b215e8957186b61bda7d8ef0d6f16e SHA-256: 08dec6c52e1b1299cfee61851cd01e2f65eda73ee4486ae14457e76a4d2bae70
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm designed to direct users to other malicious PDFs. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially malicious content hosted on domains like zajinet.ru and organize.shop.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/strik?utm_term=santa+biblia+reina+valera+1909+gratis
    • http://organize.shop/46706966537wy45m.pdf
    • https://static.s123-cdn-static.com/uploads/4423154/normal_600183b6c6682.pdf
    • https://static.s123-cdn-static.com/uploads/4484156/normal_5fd02c5ee84b2.pdf
    • http://mgacessoria.online/fagibujanajavelegqkzbq.pdf
    • http://bridgecommerce.com/nanukisu2bozy.pdf
    • https://cdn-cms.f-static.net/uploads/4446915/normal_5fda3845bbbe0.pdf
    • https://static.s123-cdn-static.com/uploads/4371240/normal_5ff95e9733cfe.pdf
    • http://topchambre.xyz/whats_the_best_order_to_watch_marvel_filmsunxxb.pdf
    • http://boxberry-24.cc/shivprasad_koirala_.net_interview_questions5m80e.pdf
    • https://static.s123-cdn-static.com/uploads/4405662/normal_60012aa0d379d.pdf
    • https://cdn-cms.f-static.net/uploads/4491670/normal_5fd2e35150217.pdf
    • http://sadovik.me/2002_buick_century_engine_size8x95v.pdf
    • https://static.s123-cdn-static.com/uploads/4417329/normal_5ff9c2969692a.pdf
    • https://cdn-cms.f-static.net/uploads/4456982/normal_5fda238e31393.pdf
    • https://static.s123-cdn-static.com/uploads/4411708/normal_5ffc58906e4a3.pdf
    • https://cdn-cms.f-static.net/uploads/4459929/normal_604bcbe95aaed.pdf
    • http://help-bluebadgecenter.com/92592646544ejve2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6739ca04-605d-4ff4-b4c9-4e5bd75a7819.filesusr.com/ugd/031dda_cf5849516e9a450780877bb38bde6878.pdf?index=true
    • https://e4da1597-3bb3-488b-9226-7c2c9e06e9ce.filesusr.com/ugd/db5d73_e006a7b9ea914bc8918d7735e67cc174.pdf?index=true
    • https://0d3c4653-ec4b-4b04-9c20-59e348ba858e.filesusr.com/ugd/62200f_fd04df08095e43d4932c459531323453.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019d37.bin
27c6c7fa33997db71662d374a9c11a8551be7389a82edbecf4d8519680ac7d1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19D37 5508 bytes
font_01_sfnt_off0001b006.bin
0383135251e5ecf3b4ef5f4354e1e107de32073f3c14de56fa0e872059e88ebe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B006 12124 bytes

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