Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e15a7ae35357993…

MALICIOUS

PDF

105.6 KB Created: 2021-04-03 21:57:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ece20dc9f92f66e0327903d16ee0bcfb SHA-1: 207cb4f12abaf40441a52e51660d80ecfb31fca1 SHA-256: 5e15a7ae353579936bf3cc8bf0f930b7911e20a793f42523e41f77c956676b1c
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://seumenha.ru/123?utm_term=class+2+amalgam+cavity+preparation+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4502493/normal_603668cb64501.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobibab/jgIjcgh/charli_d_amelio_wallpaper_cute.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476140/normal_60536df030759.pdfIn PDF document text
    • http://flymoney.net/69728790533ap8gz.pdfIn PDF document text
    • https://cdn.sqhk.co/somufegojaru/hhrAkjh/gawepadekedegin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473375/normal_603140b7c9504.pdfIn PDF document text
    • http://momsmall.space/429047509134oo4e.pdfIn PDF document text
    • https://cdn.sqhk.co/terisuzuji/kgcgfnt/91076002727.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505125/normal_602d77ac09ed1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453885/normal_600feffc51bc2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500430/normal_603cb12987e3f.pdfIn PDF document text
    • http://supfitket.buzz/98382768472y6awf.pdfIn PDF document text
    • https://cdn.sqhk.co/kixowijeka/vyjjhby/wadavigabenu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453102/normal_5fd385ab1a685.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478422/normal_6008f30dd8946.pdfIn PDF document text
    • https://cdn.sqhk.co/dilizilozok/fhdiigh/hide_and_seek_game_no_download.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://toxiwudogosos.epizy.com/96994698137.pdfIn PDF document text
    • https://3fb740b9-71d8-4183-8edb-de11b68c0a29.filesusr.com/ugd/1fbf8b_96a43631bcd347988dcdfeb60d4e12b2.pdf?index=trueIn PDF document text
    • http://kutijujivasoda.rf.gd/medical_terminology_for_students_of_the_health_professions.pdfIn PDF document text
    • https://f4e740b0-69d0-4d5c-a0c7-362dc6b2ad6d.filesusr.com/ugd/0356fc_b80ebed9aa3344d682e90bbafad07272.pdf?index=trueIn PDF document text
    • http://petirepure.epizy.com/counting_binary_trees_in_data_structure.pdfIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001337e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1337E 2900 bytes
SHA-256: 68d094faf81d2ea9f62e68ee4e789e40b6192f27e323b9e50c58fbaa8f881837
font_01_sfnt_off00013db1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB1 1872 bytes
SHA-256: 82f30745d1fb873379318f2d42ec1cec373ed0047a72e384f79ae3fc36ffe934
font_02_sfnt_off000146a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146A5 5676 bytes
SHA-256: 9515aa25c8dc600b11603533b1eba332dcdecd34c27d606abd82fbe74b038077
font_03_sfnt_off000159f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159F0 11492 bytes
SHA-256: 7ad3b35d121a248468aae5232526663a2a9d194379a03d7412ad3d56e344b2e7
font_04_sfnt_off00018130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18130 16076 bytes
SHA-256: 6d49c5076e43e024c29311683f1fbefb413b168b07b361c28ece64bf6ad50fdd

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