Malicious PDF — malware analysis report

Static analysis result for SHA-256 4639c395f2ba896e…

MALICIOUS

PDF

74.7 KB Created: 2021-03-22 05:12:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: d702b8727e081e91786f012388d73c59 SHA-1: 753823cb13db23829ecd414caf874aa314ce96a8 SHA-256: 4639c395f2ba896e4ffaca5a403361fdeade9c7ee30b85d700173f68c5af8e97
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to a book PDF, likely to encourage clicks on the embedded malicious URLs.

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.
  • 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://xezojetit.ru/123?utm_term=betrayal+in+the+city+book+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481509/normal_60225cf4de4c4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369331/normal_5fff9429a4382.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387582/normal_6034cbda51ca3.pdfIn PDF document text
    • http://fekevopimibun.sportsontheweb.net/vepumesawamabalupavu.pdfIn PDF document text
    • http://joweponula.mywebcommunity.org/administracion_de_medicamentos_via_intramuscular_fundamento.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482218/normal_603bea9ef0b56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445745/normal_6027e49f9ab38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386365/normal_6019ca6195b03.pdfIn PDF document text
    • http://tebapewulodafe.getenjoyment.net/belorawibejowumepogarilop.pdfIn PDF document text
    • http://rixujewo.getenjoyment.net/xogurudososibotuxemum.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453098/normal_5ff97e7ca4543.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2a4065d7-883d-43e8-a524-7ce9aa4b4e88.filesusr.com/ugd/ccb1c6_40179cc575c444b7ae5b2854a5f17214.pdf?index=trueIn PDF document text
    • https://4590046d-f0a9-4171-b8a0-56ff8c1fe63c.filesusr.com/ugd/0bfb20_b06c38a8c8d84d628fccd07f0083486c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/259ceb3e-bdf8-462e-953b-21e4b593fc64/from_caligari_to_hitler.pdfIn PDF document text
    • https://5ce19dfa-329f-495d-88d1-e1e7834d9072.filesusr.com/ugd/d902bb_b09a637d88164161a87b221d92b7daa2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d681009-7a7b-405b-95c8-aacafed0d048/salefuzuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/689761b4-7437-4b35-9362-c54c13f9f2ff/bajotenuse.pdfIn PDF document text
    • https://6d4a8fb0-9a8a-4850-8aa1-2b5706121c9a.filesusr.com/ugd/ff2e72_ca30f20c72c54070a1141d5aa823ee00.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d94a7c66-3ca9-4d13-80f6-ac106e6cf8cf/jiwozufiwejivupavibuzov.pdfIn PDF document text
    • http://naxesabefadufu.atwebpages.com/44th_amendment_act.pdfIn PDF document text
    • https://176fe727-baa2-4f6f-8ab0-cddcd97ecb74.filesusr.com/ugd/45df28_83a6f06da69e418faf3e4f9c9926e7ec.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_off0000e688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE688 5420 bytes
SHA-256: d8434fa41ddf0d9f3e45ffa4b1b99ac51c107de48bc8ac86cd5b203cd07f6cbc
font_01_sfnt_off0000f8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F3 10764 bytes
SHA-256: 12b60b1e01772c1d3109da046ecc899a618f05676608c28f7c0de28fdfaeb09b