Malicious PDF — malware analysis report

Static analysis result for SHA-256 a23a4823ee80b051…

MALICIOUS

PDF

70.9 KB Created: 2021-03-17 17:04:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2aea5d93585b6e5b02112dc4e8b61925 SHA-1: 1fbc195dba7e13574a356b8237ced555a006824a SHA-256: a23a4823ee80b05108ce6c4523d3577d9a5a86ca93e16c95decd64cc396ce145
124 Risk Score

Malware Insights

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

The PDF contains an external URI pointing to a suspicious domain, and heuristics indicate it's a link farm on disposable hosting, suggesting a phishing or scam attempt. The ML classifier and ClamAV detection further support its malicious nature. Although no scripts were extracted, the presence of embedded URLs and the overall structure point towards a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7769

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crophysi.ru/award?keyword=antioxidantes+y+radicales+libres+pdf
    • https://cdn.sqhk.co/wodelaganav/nijjd2C/lokedara.pdf
    • https://cdn-cms.f-static.net/uploads/4372072/normal_5fe6b3b1bd086.pdf
    • https://cdn.sqhk.co/nodujugebi/bS8ibhc/cannonball_tv_show_usa_2020_location.pdf
    • http://lnstagramsupportlives.com/will_cortisone_shot_help_tennis_elbowekt3f.pdf
    • https://wapaberupuz.weebly.com/uploads/1/3/5/3/135397773/fupitovulese-xevet-paxaxejewow.pdf
    • http://pitushok.fun/singstar_microphone_echo_ps49ekvs.pdf
    • https://cdn-cms.f-static.net/uploads/4401982/normal_603e6fda29afc.pdf
    • https://cdn.sqhk.co/jimavidozeze/4GVwicX/66002778611.pdf
    • http://lnstagramoriginal.com/majovetzihdq.pdf
    • http://50offshop.pro/file_manager_app_download_for_pcq4s6i.pdf
    • https://cdn-cms.f-static.net/uploads/4383687/normal_6030253aaa097.pdf
    • https://cdn-cms.f-static.net/uploads/4365582/normal_602e39c8ccd09.pdf
    • http://bnatural.space/pilogorusuzasubokepzl2c1.pdf
    • https://static.s123-cdn-static.com/uploads/4467950/normal_5fcb7956b81a4.pdf
    • https://lawebigatu.weebly.com/uploads/1/3/1/4/131453175/ximawewinuse-vifumuwox-jaditej-xaluj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://aca292c6-a3ee-4c96-b4c9-db15c8eca1b9.filesusr.com/ugd/cd1d52_63dbdabbb08242348a936401aced9c58.pdf?index=true
    • https://61090d85-22e6-4724-b969-52a17785150c.filesusr.com/ugd/952c2e_f54ca8338db14e53a9a8980cf1c9f6ed.pdf?index=true
    • https://d427386d-3434-45d9-8802-370857a594f4.filesusr.com/ugd/accd1f_6ba29f0281144c0599d447aa53ae3a52.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3af3c7a2-3aec-4779-9658-d06a1e536dea/water_margin_meaning.pdf
    • https://uploads.strikinglycdn.com/files/e08404c5-cc48-4f30-a257-b93e9a98429e/39778262247.pdf
    • https://2ed9768e-82a7-41f7-bc91-4b86d8d7aa0f.filesusr.com/ugd/bdbd91_25a03822dd774d41a5cb0ca9b66cbd8a.pdf?index=true
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c83.bin
929da392930643809c49016228f0c4e222c867fb38d6fd787b2ebdf2175b3e8d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C83 5448 bytes