Malicious PDF — malware analysis report

Static analysis result for SHA-256 8649976e649bbc59…

MALICIOUS

PDF

67.9 KB Created: 2021-03-30 04:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b603242f3eaf809fc2ed85c279ea4aec SHA-1: b8e8e05cd93f62e6bbd597bfe4aba7c4bcf55c82 SHA-256: 8649976e649bbc594e1d58f86e7aa771ba7e5ade54898ebfa30084a16e92fcee
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8470

Heuristics 5

  • 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
  • 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://kuzutuzo.ru/award?keyword=assessment+and+evaluation+in+mathematics+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4493266/normal_6051b45f5f8f3.pdfIn PDF document text
    • https://vesevowix.weebly.com/uploads/1/3/3/9/133987154/c44f9d3.pdfIn PDF document text
    • https://gorokose.weebly.com/uploads/1/3/4/0/134042322/tanuk.pdfIn PDF document text
    • http://finipupote.mywebcommunity.org/arquitectura_del_renacimiento_en_espaa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379987/normal_5fd11370a13b1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kivozusemu.atwebpages.com/vatobanefaf.pdfIn PDF document text
    • http://rupesujutiwu.myartsonline.com/operation_of_two_stroke_engine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/445317b5-8415-446a-954c-31a4bc3f6af9/la_casa_de_los_espiritus_pelicula_completa_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5e3600d-ec8c-4544-92f8-a873ed337b57/pilot_light_on_gas_fireplace_went_out.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5d9c23b-c5e8-47ea-8176-0fa9c8c7279a/91357627646.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b6118ca-4c47-4479-aaea-2a10a1d9f4b7/59288308365.pdfIn PDF document text
    • http://xomapagovujux.atwebpages.com/gedapisotule.pdfIn PDF document text
    • http://duvodix.myartsonline.com/jidax.pdfIn PDF document text
    • http://bifiwapaz.onlinewebshop.net/73010804708.pdfIn PDF document text
    • http://wusozupit.myartsonline.com/1044629345.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f0882a0-0c70-41e1-a524-a932a6347c19/fakunikajobetaxoge.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_off0000dd8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8F 5348 bytes
SHA-256: 40015acfec3ff33cd330335bc0cb94a6dff3ca27762a4f04796a8d695baae036
font_01_sfnt_off0000efa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA3 11072 bytes
SHA-256: bc2377f15b34136b07c9a8608bf9dd1e19344ae3df0e6e78371b442bb05ead8f

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