Malicious PDF — malware analysis report

Static analysis result for SHA-256 c725502c5df18681…

MALICIOUS

PDF

50.6 KB Created: 2021-02-02 14:46:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 8ea5e61daef505dddd5b8d27fa749534 SHA-1: 720fa86c27329c3b4f7f3b8c5f5695d39813397a SHA-256: c725502c5df186816efb86945ace88c05ea9ba5fb23adbc2ac1942ba1475d8db
252 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector domains and SEO link farms, indicating a phishing or malware distribution campaign. The heuristic firings, particularly 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM', strongly suggest this malicious intent. The embedded URLs are designed to lead users to potentially harmful content, likely as part of a broader phishing scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5623

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://crophysi.ru/aws?utm_term=american+english+language+course+pdf In PDF document text
    • https://sezulozag.weebly.com/uploads/1/3/0/9/130969806/raxuvuzuwa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474989/normal_6003ee48be5c8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502500/normal_5ff8878bc77fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376849/normal_5fdbc853805a9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473938/normal_5fc98d427cb62.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384650/normal_5fd05ff17af0e.pdfIn PDF document text
    • https://jiwosanoxonu.weebly.com/uploads/1/3/5/2/135299962/nofolatu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474223/normal_5fd2633bd766a.pdfIn PDF document text

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