Malicious PDF — malware analysis report

Static analysis result for SHA-256 02a24743e68f8574…

MALICIOUS

PDF

76.2 KB Created: 2021-09-20 08:02:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6a12ceba5483f2910a6f849aa81d039a SHA-1: 2fcfc03c4dff7f91688ff1007d83b6e2444ac94b SHA-256: 02a24743e68f85747dea2995bf922f382aa4dad7d6daf930947a9dd0e094d213
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 0.9908

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://krisoc.ru/uplcv?utm_term=bd+chaurasia+general+anatomy+pdf PDF link annotation
    • http://irollee.com/userfiles/file/fumevafunaxumut.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/43936547921.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/tisade.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/wimazovadigagidawebowuxi.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/nezabi.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/99728414921.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/86152899733.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/98776322157.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/43297224014.pdfIn PDF document text
    • https://sanagustin.cl/files/fezibesewaziboz.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/99153188434.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/31461328524.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/23530901350.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/89728900582.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/37115054989.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/najunetitu.pdfIn PDF document text
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/46269312027.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/maxipivipidawaguzutotufon.pdfIn PDF document text
    • http://htygroup.com/upload/files/58654913716.pdfIn PDF document text
    • http://juentai.com/userfiles/files/musetirenukadunovesi.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/sifomeluwiduzokiv.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/1jqa3hgrjf178jfjkot3d4lek2/8015094392.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/titinozubibexoxifejuvaso.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/20817880117.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/worawosusotesudoja.pdfIn PDF document text
    • http://gonzagafood.com/userfiles/files/18993047148.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_off0000c3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3EC 11332 bytes
SHA-256: da2d6bee2ee17ea83f65995e8719c508572a4edfb61047957f0e6270abb07b6a
font_01_sfnt_off0000de3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3C 17256 bytes
SHA-256: fc6523fca20251c8b4c5a88cc647c3d9e6d0060a3e4cebc5a02702104c8c4453
font_02_sfnt_off00010aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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