Malicious PDF — malware analysis report

Static analysis result for SHA-256 370e49055b1d42c1…

MALICIOUS

PDF

82.0 KB Created: 2021-09-19 05:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cc7d84ff4ab85627738fc7e01d8c0ab9 SHA-1: 7ed3d6a9bd37125c9ef5c051d4ad5e2e87cddf11 SHA-256: 370e49055b1d42c1a0f328586bf8f3c7d6121ec4a22510485d516dcd703ae77f
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many of which point to disposable domains, suggesting a link farm designed to obscure the true destination. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass security filters. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://masihpt2.com/contents/files/tonupinubevogixamiwo.pdf
    • https://sunkamalzemecilik.com/userfiles/file/35504098275.pdf
    • http://mebelhotel.ru/userfiles/files/77032763901.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144a77d2d5ac---23312540866.pdf
    • http://aaz.sk/editor_uploads/files/80565523651.pdf
    • http://iranjobex.com/cache/fck_files/file/xokojiguvimusasijo.pdf
    • http://aldo-ins.com/userfiles/file/65216916562.pdf
    • http://yokosohk.com/files/fckfiles/file/jazaxezirozutikubug.pdf
    • http://xdata.pl/app/webroot/img/ckf/files/15368595747.pdf
    • http://fqcycpa.com/jingkelun/userfiles/files/20210906210019.pdf
    • http://riasztoszolnok.hu/admin/fck_upload/file/46562170516.pdf
    • http://jawarakreasi.com/file/11934565664.pdf
    • https://marcvandewiele.com/userfiles/file/tapete.pdf
    • http://importfoodfair.com/userfiles/image/2021/09/file/fifelugodezesilob.pdf
    • https://lnpro.in/ckfinder/userfiles/files/76005001599.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/c31ca3cdfd13067d8042e51fc00a0a63/wojixebixi.pdf
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/78171471726.pdf
    • http://www.companyforte.com/imagenes/editor/file/bunitopi.pdf
    • http://microcement.ua/userfiles/file/duzusitoradasoput.pdf
    • http://cx-gl.hu/images/files/bikuledubikagawowumijagid.pdf
    • http://araulmor.tel-cor.com/images/library/file/putetazifurawoxarutakux.pdf
    • http://burattinojatek.hu/userfiles/file/weteme.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=my+phone+not+detecting+wifi
    • 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_off0000dbc4.bin
61249e6fa14a8238584b85e9f43bbe076d402534604161f3eb71a1865fe8a162		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC4 10616 bytes
font_01_sfnt_off0000f3d3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D3 16792 bytes
font_02_sfnt_off00010be5.bin
b41f77ddfc51d5dbf0c0eac085e3d3df85b49cd62cab472ea5b5986cdb96bd0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE5 18080 bytes

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