Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ad853a41e38a78d…

MALICIOUS

PDF

70.3 KB Created: 2021-10-06 10:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b523872d8e248e6979b0c5b5781f93ec SHA-1: 2056865d01b4ca728ddb14ab69c8e48d2518ad39 SHA-256: 8ad853a41e38a78df5240622fd2f7458e0443f5b8970bd9fa419f25a5fd8bfa4
94 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and exhibits characteristics of a link farm, with numerous embedded URLs pointing to disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of this document being used to distribute malicious content or conduct phishing attacks. No scripts were extracted, but the presence of many unknown reputation URLs suggests a primary function of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4326

Heuristics 4

  • 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
  • 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 http://metallpress.ru/files/27527147658.pdf In PDF document text
    • http://invismortgagebroker.com/images/file/52817074245.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/kotazadixusipuradabopodeg.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/dikaxusuvevutukug.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/fakizek.pdfIn PDF document text
    • http://internet-trade.cz/UserFiles/file/nufovezoja.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/67196820597.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae205ddbad---49420905633.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/xaritakodekigun.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/ridakimozefumujituxo.pdfIn PDF document text
    • http://elcivan.com/admin/UserFiles/file/86187761559.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/fewemusufiv.pdfIn PDF document text
    • https://defi128.phpascal.com/userfiles/files/29455610438.pdfIn PDF document text
    • http://rainternacional.com/userfiles/file/22383525832.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/5720323490.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/fulomatuzitazu.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409e08f3fe8---kebojinepejedukore.pdfIn PDF document text
    • http://topp.pl/_topp/file/41287209192.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/36122753908.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/3991974904.pdfIn PDF document text
    • http://atrsara.ir/resource/files/93705390135.pdfIn PDF document text
    • http://greenvisioninternational.gm/userfiles/file/13341850485.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/9070340577.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=words+that+start+with+m+and+end+with+bPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7D 10688 bytes
SHA-256: 0d9de4735e2afc9cfa056a8086fb48cfea9f77f92239f26a2b620e50a169a690
font_01_sfnt_off0000e3d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D8 18308 bytes
SHA-256: cc4c722d6da3d41f7ea462584b0206e6071c2b1a696ed1d449005b03ac2e969e