Malicious PDF — malware analysis report

Static analysis result for SHA-256 c21614fdd7eb1e8f…

MALICIOUS

PDF

50.6 KB Created: 2021-02-13 09:45:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 92768392163d184979129e3f44a8915e SHA-1: e58661178f9b415bc5e110bf3f2c8c543e92875c SHA-256: c21614fdd7eb1e8fe5fb828325590a655380eb614e97619401fc4e380b355b89
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier also indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious activity, likely related to directing users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7360

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://jacksth.ru/aws?utm_term=work+project+timeline+template PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4452835/normal_6010fdde32854.pdfIn PDF document text
    • http://policyhelpcenter.com/nfs_heat_studio_mod_apk_1._5._0ilmj3.pdfIn PDF document text
    • http://quinzsy-studio.design/pijekagosung1vzy.pdfIn PDF document text
    • http://ch-data-2a8fv9s.pw/general_astronomy_textbookl44mr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389365/normal_5ff0d6f15d360.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373241/normal_5ffbad14d9818.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391920/normal_5fc6b821dd594.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456116/normal_5fd1e55ea9087.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366308/normal_601dd2ad65ea6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372682/normal_5ff569d1ac1c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490141/normal_5fd77c729e1a8.pdfIn PDF document text
    • http://nonretloli.site/walajeluxifogujofidhv7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412377/normal_5fdbe0a747564.pdfIn PDF document text
    • http://copyrightsupportforlnstagram.com/avatar_movie_in_tamilrockers._lvv2ivl.pdfIn PDF document text
    • https://nuzunovi.weebly.com/uploads/1/3/5/3/135314570/ruroledolejugojasu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426088/normal_5fdb7600dec4f.pdfIn PDF document text

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