Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6b20c24d64d5fb6…

MALICIOUS

PDF

77.7 KB Created: 2021-02-09 18:52:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 885576b8e6c2b7b9a9c38439714f7fc9 SHA-1: 32248bdb95bebd38dfd6358b7a4b716466778b5c SHA-256: a6b20c24d64d5fb617bdc33b0ac19e52c59a1327667e06ea2c9a52752c774791
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many of which appear to be part of an SEO link farm designed to redirect users to potentially malicious sites. The primary redirector URL, https://jacksth.ru/123?utm_term=skyrim+dead+men%2527s+respite+exit, suggests a lure related to game content, likely for phishing or malware distribution. ML and ClamAV heuristics strongly indicate maliciousness, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/123?utm_term=skyrim+dead+men%2527s+respite+exit PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4424376/normal_5fdbc2fd3f2d0.pdfIn PDF document text
    • https://cdn.sqhk.co/loxepafigav/dGMgia5/kodelujemel.pdfIn PDF document text
    • https://cdn.sqhk.co/poronujefino/jijegdO/best_hill_country_road_trip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475582/normal_5fd14a8ecf949.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405194/normal_5fdb3693a05e9.pdfIn PDF document text
    • https://cdn.sqhk.co/bamazaludez/OjjiBX6/78502688095.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462345/normal_5fe037b309cc2.pdfIn PDF document text
    • https://cdn.sqhk.co/mumesimasozo/gfNjenR/kevawakix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474478/normal_5fd16ff273b65.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496165/normal_600849105f7fb.pdfIn PDF document text
    • https://zizeximafebofiz.weebly.com/uploads/1/3/4/3/134369397/683a4de6eeee5a.pdfIn PDF document text
    • https://cdn.sqhk.co/kixituvelil/jjdheUF/dapibivikafowadibunal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530036/normal_601b051f7b4ee.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/fadadedezeker/free_math_division_worksheets_5th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/furunumaroxun/21354730180.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_off0000f44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44B 5444 bytes
SHA-256: c8d9553b27c96e8c1e2e73baeb0c5d4e04f1f0b5e37a2d9e415e399134459af4
font_01_sfnt_off000106cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CF 10344 bytes
SHA-256: fa0525260b2978e3fff98d815371a6db1c67c0469c3cb766ec04aaf767bb9ae1

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