Malicious PDF — malware analysis report

Static analysis result for SHA-256 c67d163042deaad7…

MALICIOUS

PDF

52.6 KB Created: 2021-04-01 09:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 947fac547c5383ee159f5096ac94c07e SHA-1: ffb4f5b81eae8edbb2d47b14b88114273bbcc147 SHA-256: c67d163042deaad7f59c51a65581e84420d281055b965ff2a1c8c56642935d02
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of external links, identified as a link farm. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a non-standard structure aimed at manipulating search engine results or directing users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9113

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 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.
  • 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
  • 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://gimoguvi.ru/strik?utm_term=nutritional+information+arby%2527s+curly+fries PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366040/normal_5fe81bfef2dbf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448332/normal_5ffd04b68e30e.pdfIn PDF document text
    • https://cdn.sqhk.co/sarimotel/Thctjju/best_deals_on_apple_watch_series_5_canada.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497372/normal_60466c56a9e5f.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/Gijjhq7/vepoxonojimugapotap.pdfIn PDF document text
    • https://cdn.sqhk.co/tevosudav/tjjETih/heart_rate_monitor_watch_apple.pdfIn PDF document text
    • https://cdn.sqhk.co/kegetaxob/jjjFkgh/83064665445.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481403/normal_6033f0ea79b5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402014/normal_603afddedfae5.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/CFgdiND/wobokosomapodotiw.pdfIn PDF document text
    • https://cdn.sqhk.co/jurugaguvedu/jWfjh3H/wedokunovufifib.pdfIn PDF document text
    • https://cdn.sqhk.co/jamasedese/ridjaqs/flow_free_bridges_apk_full.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494893/normal_601bb909b6c73.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420476/normal_5ffbb85e7e91b.pdfIn PDF document text
    • https://d19688e0-347f-4d9d-8cb3-d47c6e049f3d.filesusr.com/ugd/c618e9_048003225fc145f6baac2bc7255f1299.pdf?index=trueIn PDF document text
    • https://c9977776-9e37-4432-9eae-e541147807da.filesusr.com/ugd/bb6cc6_cdd12e0c6a6e46d5bdfc5be2525afade.pdf?index=trueIn PDF document text
    • https://27dd58ca-3bab-4825-b0a2-cb75a9f796de.filesusr.com/ugd/aba4c5_0b218f1d5f4845c39a6f8e8faa50660d.pdf?index=trueIn PDF document text
    • https://77701ba7-c5ad-4750-ab17-5b03548f7fc0.filesusr.com/ugd/9a242c_d32141fc0148411583591793193ddcb6.pdf?index=trueIn PDF document text
    • https://e809654a-a95b-4dbc-a338-24085255a2f8.filesusr.com/ugd/1b6cec_e783e0321b52498bbc14e2dd212191a9.pdf?index=trueIn PDF document text

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