Malicious PDF — malware analysis report

Static analysis result for SHA-256 508e6c3edf2ad8a3…

MALICIOUS

PDF

76.3 KB Created: 2021-03-11 16:19:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0d7425ecfb606db6bd4dd3d68ad509f2 SHA-1: 5596806eca58ee1dae547704ed7a0083c3afd88e SHA-256: 508e6c3edf2ad8a347911500913cd208720a154303110740a5cac5e025841996
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

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 0.8907

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://golowaki.ru/award?keyword=certificado+de+calidad+ambiental+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366304/normal_60057436be635.pdfIn PDF document text
    • http://urott-hu.com/cognitive_biases_in_medicine2c5vq.pdfIn PDF document text
    • https://cdn.sqhk.co/wafixagi/SRGX64U/colorado_switchbacks_tickets.pdfIn PDF document text
    • http://medebupima.sportsontheweb.net/fundamentals_of_digital_logic_with_verilog_design_solution_manual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481061/normal_5ff5a6e6395be.pdfIn PDF document text
    • https://cdn.sqhk.co/segevenujuka/gh7pGji/nearcut_admin_login.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471082/normal_5fd2d48541519.pdfIn PDF document text
    • https://lanilemu.weebly.com/uploads/1/3/1/3/131381326/gilemev.pdfIn PDF document text
    • https://natadafupekex.weebly.com/uploads/1/3/1/8/131856288/88868ea4.pdfIn PDF document text
    • http://goldstein.berlin/wobixepegetegogex6wekl.pdfIn PDF document text
    • https://cdn.sqhk.co/tolebilu/ibNAC0V/61391607392.pdfIn PDF document text
    • https://cdn.sqhk.co/vixukose/jaer2JL/muxus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403121/normal_5fd1d47e66c15.pdfIn PDF document text
    • http://wozupabalaviv.medianewsonline.com/niv_study_bible_notes_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417643/normal_603dfa992abf8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://55d63786-14d6-44de-84d0-33f1fb383c44.filesusr.com/ugd/45fd81_1f885ca35a314bde8f004b9e23fd7d96.pdf?index=trueIn PDF document text
    • https://92fed17e-af34-466b-b3fe-38cd9ef27699.filesusr.com/ugd/192d58_c21bc13e3e1a4e8a8539a8b2d751e88c.pdf?index=trueIn PDF document text
    • https://a815f367-2516-4b88-9496-eed07d5c1eb7.filesusr.com/ugd/665c20_108e2c89f8a3463ebe68cbc3fe01ae8b.pdf?index=trueIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C3 5168 bytes
SHA-256: 4bb922ad159491df90388a4cf72babfb149d1166b32de7426220bd2c8ec93aae