Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c945451ea6e49a9…

MALICIOUS

PDF

71.5 KB Created: 2020-12-25 06:15:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 7b2982b880aa81233bbf2042531a86b5 SHA-1: 3c7f48ecd9f56ab1f54f8055e42b776cf54d4930 SHA-256: 3c945451ea6e49a94d8807749bc1986bf89eed4eb74e5dbcc783e9543a6b4aea
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier, indicating it is a phishing or trojan delivery attempt. It contains a link farm with numerous external URLs, including a redirector at 'https://trafftec.ru/123?utm_term=increasing+cost+industry+definition', suggesting an attempt to direct users to malicious content. The presence of embedded PDF link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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
  • 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://trafftec.ru/123?utm_term=increasing+cost+industry+definition PDF link annotation
    • https://cdn.sqhk.co/wememiguw/haHjfKY/snakes_and_ladders_online_3_players.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368750/normal_5f93b9ca50b6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371812/normal_5f8e3e2fdc63b.pdfIn PDF document text
    • https://cdn.sqhk.co/punenekebi/jdgcojg/crafting_and_building_skins.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459163/normal_5fcc75e706bbd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365601/normal_5f87177226f73.pdfIn PDF document text
    • https://rutobugexamaxip.weebly.com/uploads/1/3/4/5/134508198/nizesuribojaval.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jozaponi/tarifixarix.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/l_orthographe_lexicale_et_grammaticale.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/57286971492.pdfIn PDF document text
    • https://s3.amazonaws.com/kiwopusafize/wiwuzuwodigepugamape.pdfIn PDF document text
    • https://s3.amazonaws.com/wujixus/cheat_sheet_tft_9._22.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE9 5196 bytes
SHA-256: 3a04a11705e8ef268311e18480b976019d57430840f269c6c53a5e0c0980d9cb
font_01_sfnt_off0000ecaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAF 10556 bytes
SHA-256: 2829204b1ac18eb434bd69e74ffc68ea8353e50943beda1a3ef467ec5600395e

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