Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8b49d6cfb8e5ad5…

MALICIOUS

PDF

73.4 KB Created: 2021-09-23 16:44:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0fc7daa013f113e89925817958afe971 SHA-1: 594c91c1cef097ac85dee5df8427dd1815c6fdfb SHA-256: d8b49d6cfb8e5ad5b7b06f3b8da88d95f71293044e548bdbb505471f3fdac677
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ClamAV detection further confirms its malicious nature, identifying it as Pdf.Phishing.Trojan. While no scripts were explicitly extracted, the presence of many external URIs suggests an attempt to redirect users to potentially malicious sites or for SEO manipulation. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier clean score 0.2303

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 https://gyn-koe70.de/obrazky/file/xovok.pdf
    • https://papersacksfactory.ae/images/bulk_images/files/45283024443.pdf
    • https://firsatpin.com/calisma2/files/uploads/31330395670.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141230d03741---6108394879.pdf
    • http://tcgardening.com/userfiles/file/2021090115490073499.pdf
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/25678485177.pdf
    • https://bestrecycledautoparts.net/images_i/file/zoxukel.pdf
    • https://wtmasonry.com/ckfinder/userfiles/files/tuvubulegubarumawepiwig.pdf
    • https://dongcohonda.com/userfiles/file/zurudedamupezen.pdf
    • http://ljjxmining.com/uploadfile/file///2021091915495829.pdf
    • http://orderkai.com/uploads/files/zewatuz.pdf
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/xuzegases.pdf
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93502831391.pdf
    • http://zamaro.cz/images/fcke_files/file/zazejuserobuba.pdf
    • https://ryokanclub.com/FileData/ckfinder/files/20210906_65E2D46E8ED98F10.pdf
    • http://jshanwoo.com/ckfinder/userfiles/files/19206807604.pdf
    • https://stiff.pl/ckfinder/userfiles/files/xusexobeludimisewika.pdf
    • http://zhizhencn.com/filespath/files/20210902232427.pdf
    • https://delta-relay.be/userfiles/file/97198245038.pdf
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/tumirilenepevubam.pdf
    • http://ventmetal.ru/userfiles/files/nepon.pdf
    • http://akicgiyim.com/userfiles/file/xunigekikugizufutites.pdf
    • https://luckyfood.itweald.com/uploads/files/613d575f64d07.pdf
    • http://glovimex.com/uploads/ckfinder/files/18818752855.pdf
    • http://phuongdonggolf.vn/app/webroot/uploads/files/60884859228.pdf
    • http://shimamura-mail-order.com/userfiles/file/relolarasavomavod.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=boruto+episode+201+free
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcc9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC9 16792 bytes
font_01_sfnt_off0000f4e0.bin
942b032cb5b02cf7eea5d9317e9b72e6ec601165fefe9f791e10d8106a5f1d40		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E0 10628 bytes

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