Malicious PDF — malware analysis report

Static analysis result for SHA-256 223f3b962fa0ce79…

MALICIOUS

PDF

81.3 KB Created: 2021-04-03 22:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 5fb2293f51ac08c59044059ab3eeed10 SHA-1: 999591ac916c7b94ad8f65ea9c3e190a1aef0f76 SHA-256: 223f3b962fa0ce796246def4d3a5ac4a3c06b12ba63c242a2e2eed8cb840ef1f
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, with a significant number pointing to disposable hosting and potentially malicious domains, indicative of a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, a tool often abused for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://nipisod.ru/wix?keyword=what+are+the+stages+of+clay+preparation PDF link annotation
    • https://xejukosaxup.weebly.com/uploads/1/3/1/4/131437924/8577105.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501198/normal_5ffece685ef5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496580/normal_6040e3996c3bf.pdfIn PDF document text
    • http://pokovata.scienceontheweb.net/157125565.pdfIn PDF document text
    • https://katozela.weebly.com/uploads/1/3/0/8/130874493/lupulifuvesukejus.pdfIn PDF document text
    • https://mijawogutudegi.weebly.com/uploads/1/3/4/3/134374589/xebafi_xomus_muzutasute_gatol.pdfIn PDF document text
    • http://janipuwibir.mywebcommunity.org/16741657002.pdfIn PDF document text
    • http://bidimiw.sportsontheweb.net/94853631784.pdfIn PDF document text
    • https://s3.amazonaws.com/jopomodilamego/gumivebemulaxejajomovez.pdfIn PDF document text
    • http://pobadabodoz.scienceontheweb.net/ccna_book.pdfIn PDF document text
    • https://s3.amazonaws.com/mexesazaxasa/quran_arabic_text_with_english_translation.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370268/normal_6012348b8c8bf.pdfIn PDF document text
    • https://lifulufo.weebly.com/uploads/1/3/1/3/131379971/moxuvuruza-magegopu-palulojelubeb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367622/normal_5ff2b98e51bbf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1e8c0764-4a0f-46ab-84a2-5f63a8a44928.filesusr.com/ugd/6a0acf_ce4686afd355415c8fe037600917ff23.pdf?index=trueIn PDF document text
    • https://1bf92926-22d0-44a1-94fb-b51843c41cd5.filesusr.com/ugd/762c1a_aa42d2ad52fc4f138bb23c5a250fbce9.pdf?index=trueIn PDF document text
    • https://00f02ae0-031c-4cf4-85c3-86bbc6d7deb2.filesusr.com/ugd/13f2e4_64effe6bef7341049414836c11562a88.pdf?index=trueIn PDF document text
    • http://lojibovel.myartsonline.com/flower_shop_business_plan_philippines.pdfIn PDF document text
    • https://def26600-86c9-4442-a738-094ddf2992d1.filesusr.com/ugd/eb5a6a_171da910f528404a9305d7110ae72edb.pdf?index=trueIn PDF document text
    • https://78636f1b-f2d6-4e4a-b4e1-07eac4c165d1.filesusr.com/ugd/434c97_cdd491fba7f747a186b1c40426ad92ce.pdf?index=trueIn PDF document text
    • https://72cdfa97-b5fe-44cc-9aa9-3142b5aa642a.filesusr.com/ugd/ee32c9_6e966219a45e4880bd12f374328d33f0.pdf?index=trueIn PDF document text
    • https://a3720f92-bdaa-4449-a3ff-14f36884d2d5.filesusr.com/ugd/afadc3_8d421ae286f74cb8bec015e9fc9ad3c2.pdf?index=trueIn PDF document text
    • https://34e51215-b586-4e01-b3ea-a219475a7b91.filesusr.com/ugd/46481b_af067d4524944c5a9e0b83bf4f4aace9.pdf?index=trueIn 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_off0000fe12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE12 5392 bytes
SHA-256: 8d057951c70f794aad7db3fe8ee069d581248f0b3ea05586665ef137476a2cc8
font_01_sfnt_off0001107e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107E 11252 bytes
SHA-256: 6be519768d8a5aec7512741cab7311b6c7b21a9729c3ba4ebb715798d262f4b2