Malicious PDF — malware analysis report

Static analysis result for SHA-256 29d383da3ef8a97e…

MALICIOUS

PDF

86.8 KB Created: 2021-09-23 17:15:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 350f371c1b34138e014cea9817a4c13c SHA-1: 638f9a80042bd8e46ff3307d535f736ff5670d63 SHA-256: 29d383da3ef8a97e3a299235e0f359282bc3b6e724b4377a767d071dfe346f3b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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 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://laborke.ru/uplcv?utm_term=apk+obb+file+battlegrounds+mobile+india PDF link annotation
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/53895007012.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/13198338547.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/14457697903.pdfIn PDF document text
    • https://axlthailand.com/imagexx/files/15974462313.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/21523298921.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2a2fba218---32570740292.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/talulidalawasepoju.pdfIn PDF document text
    • https://nurdagihaber.com/resimler/files/24271606466.pdfIn PDF document text
    • https://ecoledesgourmets.com/userfiles/file/49360268098.pdfIn PDF document text
    • http://soncongnghiepjotun.com/media/ftp/file/46100573432.pdfIn PDF document text
    • https://medpressa.ru/files/file/merekibademekuzigumus.pdfIn PDF document text
    • http://www.luna1956.com/images/library/File/mefon.pdfIn PDF document text
    • http://phanmemerp.vn/attachment/files/28244740888.pdfIn PDF document text
    • http://chinalabware.net/d/files/rovemopejonewizedaxitu.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/20827913356.pdfIn PDF document text
    • http://www.vnos.vn/app/webroot/uploads/files/lopixo.pdfIn PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/falurito.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/dekuv.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/vigogeviwotewilozalula.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/userfiles/fichiers/fenapa.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/temotuge.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/manimivosaxuvupakuwulukir.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161447b890a1ba---93946133573.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF54 1860 bytes
SHA-256: 562d39cc93351683f3420870a5578826c1285db13c691c08f99be18f4980e560
font_01_sfnt_off0000e80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10021 11156 bytes
SHA-256: f08d4cdc2f3820ed813229b330027efa27b5682526acc878d0ef58c6ec9db8b7
font_03_sfnt_off000119c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C2 19596 bytes
SHA-256: 4beb92c9b7a500a7a8a9a67ee6653dc4893e9191ff2ecbbbc43eca69acf63a56

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