Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d65c4da75b9143f…

MALICIOUS

PDF

63.0 KB Created: 2021-03-22 18:25:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5481781cd2bcffa5cb47c6ebb9cee1bc SHA-1: 35b3902ae1e52b88e1e8291daf70775f078e261d SHA-256: 9d65c4da75b9143f337b9ccfef46c801776d1f905310f0cc6706998bd4edbfd3
124 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically pointing to a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs suggests an attempt to redirect the user to a malicious site, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7955

Heuristics 4

  • 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 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://leonvi.ru/strik?utm_term=twilight+free+download
    • https://static.s123-cdn-static.com/uploads/4496586/normal_5fcc536057b15.pdf
    • https://cdn.sqhk.co/komukopa/fgfjf63/animus_harbinger_mod_apk_1._1._5_download.pdf
    • https://dolujutizividev.weebly.com/uploads/1/3/4/8/134864897/wovur-teliki.pdf
    • https://static.s123-cdn-static.com/uploads/4449998/normal_5feb03720aff8.pdf
    • https://cdn.sqhk.co/bafuberudod/edhNo03/48542655729.pdf
    • https://bafobuxog.weebly.com/uploads/1/3/4/3/134316473/madomijifesaxiz.pdf
    • http://usejus.pro/what_language_is_best_to_learn_for_codingmagn2.pdf
    • https://cdn-cms.f-static.net/uploads/4375194/normal_6025fa5a33cd3.pdf
    • https://cdn.sqhk.co/gabazumad/FUidhbu/78371604679.pdf
    • http://myvenza.ru/accp_guidelines_treatment_pulmonary_embolismvb07z.pdf
    • https://tejegedalozo.weebly.com/uploads/1/3/4/8/134870252/worega.pdf
    • https://cdn.sqhk.co/xipepovivik/iggf50y/santorini_archeology_site.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9b2040b0-8265-427a-bb87-82048507eb65/how_do_i_connect_my_subwoofer_to_my_soundbar.pdf
    • https://acfc0e76-311d-46af-9c13-f46c112eb424.filesusr.com/ugd/f90bad_12047d7c2ffb4246a22feb930701c943.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a37ef54c-bf41-4623-9ad5-36f01e8813ee/public_health_administration_masters_programs.pdf
    • https://uploads.strikinglycdn.com/files/d1d8f6fd-deca-4fb8-9027-e517871b4985/4855169085.pdf
    • https://uploads.strikinglycdn.com/files/2cfb13cd-553a-4237-b65a-fda014ef47d7/best_criminal_attorneys_near_me.pdf
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_086f6783723a42c89e7803d375c4a6b8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a5070c0d-2d41-41b3-a8e3-d29b66b2ac9b/21667391433.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e186.bin
ead013d1b6685efe1aab9aeb478810213c4aa7a49514cb6558e45368e74fd52b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE186 5032 bytes
font_01_sfnt_off0000f2a8.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A8 1800 bytes