Malicious PDF — malware analysis report

Static analysis result for SHA-256 77f326fd7e18dd84…

MALICIOUS

PDF

58.6 KB Created: 2021-02-07 07:54:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 5f759f0d11fea5b246f09863af156097 SHA-1: a664dbbfa99b2deda110f06bf246db2a032d9d92 SHA-256: 77f326fd7e18dd84089bc3d84427a515ffe90144f8f78222c50d44e2845bd2bb
194 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 point to SEO-optimized PDF files, suggesting a link farm or phishing campaign. The primary URL, 'https://druttle.ru/aws?utm_term=covalent+bond+lewis+dot+structure+practice+worksheet', is identified as an SEO redirector, likely used to funnel victims to malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8844

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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://druttle.ru/aws?utm_term=covalent+bond+lewis+dot+structure+practice+worksheet PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4461505/normal_6006fbd1e8e36.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424632/normal_5fde5dca6b72d.pdfIn PDF document text
    • https://rotaxavevun.weebly.com/uploads/1/3/4/8/134884867/b2254374895f.pdfIn PDF document text
    • https://dutumeparozawa.weebly.com/uploads/1/3/1/1/131163590/6535621.pdfIn PDF document text
    • https://vojanaxopij.weebly.com/uploads/1/3/1/4/131453451/katezirefebup.pdfIn PDF document text
    • https://pakajifovajopif.weebly.com/uploads/1/3/1/6/131607230/782d77b10cd7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487381/normal_600605b96d412.pdfIn PDF document text
    • https://cdn.sqhk.co/nakijalufiw/iX80mp5/keto_shopping_list_walmart_printable.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefimex/hgK2fsf/9077058360.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368221/normal_5fccee74a8667.pdfIn PDF document text
    • https://cdn.sqhk.co/jivonotiso/iiigSKD/download_great_battles_medieval_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/mekizojo/NRiegh3/magic_tiles_3_gameplay.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477367/normal_600256792bf66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459054/normal_5fe9852576970.pdfIn PDF document text
    • http://mifilud.iblogger.org/22997033147.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368489/normal_5fc5f985bd15e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454545/normal_601d976b62200.pdfIn PDF document text

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