Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e370e7625edab64…

MALICIOUS

PDF

69.1 KB Created: 2021-09-30 10:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2be99c72f8be6aa2c1dcd6d2ef2a15fc SHA-1: 539a90c360806fcb624df74f9d3e150684e16e7a SHA-256: 5e370e7625edab64eed4e7f19300da819e6cbd61d29e70c5436f9d5140c707f5
126 Risk Score

Malware Insights

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

The PDF contains numerous external URLs, indicating it functions as a link farm. Heuristics suggest it's a non-clustered link farm on disposable hosting, with one URL specifically pointing to a PDF file. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://drafthe.ru/uplcv?utm_term=core+servlets+and+javaserver+pages+pdf
    • http://dtmaso.com/public_html/Imagens/file/26705945228.pdf
    • http://masan315.net/board/imagefile/file/biselowamidunexabonevulud.pdf
    • https://mayxaydunghoangphuc.com/userfiles/files/ninekaxezulija.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b537bd11fa---7665057368.pdf
    • http://vinacafe-dalat.com/Images_upload/files/vabesojuzipesejitepez.pdf
    • https://feldmann-spedition.de/pics/userfiles/file/9093887788.pdf
    • http://www.cddfct.com/up_files/file/wavev.pdf
    • https://areopag.ru/sites/default/files/uploads/4811019803.pdf
    • http://fullerton.kopanramen.com/uploads/files/49306133360.pdf
    • https://nnt52.ru/userfiles/file/2888329826.pdf
    • http://champagne-marc-chauvet.com/images/files/48044518560.pdf
    • https://shirbandifelt.com/userfiles/file/gudisewib.pdf
    • http://4seasonstours.in/userfiles/file/bawebomoxilore.pdf
    • https://gelblighting.com/userfiles/files/wasuxewuruditomuwakusi.pdf
    • https://ihotel2b.com/upfiles/editor/files/85322926556.pdf
    • http://printrun.nl/userfiles/files/16302791975.pdf
    • http://kukdae.com/files/fckeditor/file/6761658720.pdf
    • https://agmatbaa.com/upload/files/pixox.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161413c82eee73---17293702440.pdf
    • http://tayles.com/uploaded/91131673062.pdf
    • https://betalinktech.com/blmedia/file/97377858309.pdf
    • https://inprovitbolivia.com/ckfinder/userfiles/files/89610479537.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b0aa.bin
2e74ea286afc230addd18ae53aa52ccfd02766896e15aedee7bdc1b3f1394513
pdf-font-stream PDF embedded font (sfnt) at offset 0xB0AA 10808 bytes
font_01_sfnt_off0000c998.bin
552f5b0c04188db7e430187aec9c72609f5e4e7463c77d5da7d87c8a1f14df7c
pdf-font-stream PDF embedded font (sfnt) at offset 0xC998 15004 bytes
font_02_sfnt_off0000eea8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA8 16792 bytes