Malicious PDF — malware analysis report

Static analysis result for SHA-256 285d94f1a8890d63…

MALICIOUS

PDF

74.3 KB Created: 2021-09-11 17:11:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 044af862822c58570243bdd400eb4981 SHA-1: cd09b6d9f62f503b93ebdb66c2f850945ab965dd SHA-256: 285d94f1a8890d6301c0293f1fc3f4aa9e9468318c8dfd080d7da329f690b3a4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9973

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://infrive.ru/uplcv?utm_term=name+the+parts+of+the+appendicular+skeleton PDF link annotation
    • https://letstravelforacause.com/miet/assets/files/senokoborunurimore.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/79441115496.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/bavuxiriseluwusipuzetulof.pdfIn PDF document text
    • https://jmclimatizacionhvac.cl/images/subidas/file/11044824019.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/fupetedageladotolujared.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/kemosukalumajewaduzan.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/45668110099.pdfIn PDF document text
    • http://natalieshuff.com/uploads/file/somipelojebulebid.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/josamugidexevudoferoxeru.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/83260188661.pdfIn PDF document text
    • https://somos.co/dleyes/admin/fotos/file/guxafonun.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/79516621358.pdfIn PDF document text
    • https://illinoisfiscalpolicycouncil.org/app/webroot/userfiles/file/87830134727.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/limakoguzuko.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/zukitujarariz.pdfIn PDF document text
    • http://cocoon-source-harmonie.fr/public/file/1449266538.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/161d64acb3234d1a1a54e2e2907afd3e/83234530885.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/80039933453.pdfIn PDF document text
    • http://codienlanhtrangia.com/Images_upload/files/xuragivubipufavap.pdfIn PDF document text
    • https://investkwik.com/userfiles/file/52758213843.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/riwikufuwemufukugaxorar.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/28109571166.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613145517191b---xidaki.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/lumawefajamubiko.pdfIn PDF document text
    • http://texmet.pl/userimages/file/20108513239.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA0B 18248 bytes
SHA-256: 0407a54d0d24cbaec8b11b254068b131073ea5f12bfd016c54046527db134e49
font_01_sfnt_off0000e97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10192 11056 bytes
SHA-256: 1a870b1c63fec0a772e62609c8ec9e6fc6d1380230e00cf1614a1fce15293b7b

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