Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b6f73c494498a1a…

MALICIOUS

PDF

70.9 KB Created: 2021-02-28 06:55:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: ec5e8096a47e70d97db4ef42b28eb0a7 SHA-1: 8d5d396676301c328319918ce628bdce355bf1c8 SHA-256: 3b6f73c494498a1a9c1e4312f86846e2e79821bb9e1518251ba25be59161fc30
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs, with a primary focus on https://mezovuduw.ru/award?keyword=hec+hms+vs+hec+ras. The document body is heavily obfuscated, preventing a clear understanding of its direct user-facing content, but the heuristic firings strongly indicate a malicious intent related to SEO manipulation or phishing through a large number of external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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.
  • 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
  • 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://mezovuduw.ru/award?keyword=hec+hms+vs+hec+ras PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4482407/normal_5ffddc88de258.pdfIn PDF document text
    • https://vurovovi.weebly.com/uploads/1/3/4/0/134040995/gekupexe_lisebuw.pdfIn PDF document text
    • https://cdn.sqhk.co/gefisodir/eNljf2A/free_download_bubble_trouble_games_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/fusexabuvej/hcgcwgj/wwe_universe_game_cheats.pdfIn PDF document text
    • https://cdn.sqhk.co/xurajalijok/haOjjgN/doodle_alchemy_animals_game.pdfIn PDF document text
    • https://cdn.sqhk.co/fekigimuzib/Kijyhaw/kofanezulatixi.pdfIn PDF document text
    • https://kemodiduwe.weebly.com/uploads/1/3/4/2/134235489/3220338.pdfIn PDF document text
    • https://jowetirepenu.weebly.com/uploads/1/3/1/3/131383619/vusumun-tixevopov-wizuzebejalufa-disomajabap.pdfIn PDF document text
    • https://cdn.sqhk.co/ruzemesafe/hgdjjdK/anime_sticker_whatsapp_apple.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485016/normal_6010fd307067c.pdfIn PDF document text
    • http://fulusixavopowem.iblogger.org/goose_down_fill_power_guide.pdfIn PDF document text
    • https://judadumoxa.weebly.com/uploads/1/3/4/7/134718892/xerizemog.pdfIn PDF document text
    • https://cdn.sqhk.co/xivovido/hjShehh/buzobugomosog.pdfIn PDF document text
    • https://cdn.sqhk.co/gigemuji/FggDWxQ/24342424100.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pujumek.myartsonline.com/62300060765.pdfIn PDF document text
    • http://nimuwixoxuwe.epizy.com/vixet.pdfIn PDF document text
    • http://tamufigavoxi.rf.gd/falkor_neverending_story_flying.pdfIn 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_off0000e351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE351 5028 bytes
SHA-256: 5acf491c3abc670a708bf5c8209bed634659c98ad1154299dec7f0af845a4479
font_01_sfnt_off0000f442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF442 10000 bytes
SHA-256: 0d7dc2fc4f671738ca28bfc61ba423891e6c6dde6d67928c7cdb6e4930662890

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