Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b59771325a56f31…

MALICIOUS

PDF

72.2 KB Created: 2021-10-01 01:53:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f88bfebc1ec0313329bdfa3a6f1cbadc SHA-1: eb5cb85bc0c8ab305907ba0712563d04c5451716 SHA-256: 9b59771325a56f3162563ae5d64c006c6a5abe4d142c042d8a39278aec775527
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to suspicious domains, suggesting it functions as a link farm or phishing lure. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating the PDF is designed to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://galerie-louise.be/userfiles/files/48064567333.pdf
    • http://bochkari24.ru/pic/file/pegaloxo.pdf
    • https://mangalargalux.com.br/ckfinder/userfiles/files/vagusixejitet.pdf
    • https://condominiovillage.com/userfiles/file/52714653075.pdf
    • http://domadoma.cz/userfiles/file/83253145941.pdf
    • http://fazekaskozpont.hu/images/upload/file/regemigagi.pdf
    • https://olivierdaulte.com/ckfinder/userfiles/files/39914705629.pdf
    • https://aymexco.eu/ckfinder/userfiles/files/kekonejakanuxukogowegazek.pdf
    • http://dxczx.com/ckfinder/userfiles/files/20210906_004233.pdf
    • http://ledlight-lamp.com/mingyi/images/userfiles/file/luwurewavizabajakugita.pdf
    • http://dragonspond.com/uploads/files/89011709028.pdf
    • http://www.bc-arman.kz/ckfinder/userfiles/files/lurosopifim.pdf
    • http://hissekurban.com/resimler/files/21273345044.pdf
    • http://toyotarent.tw/FileData/ckfinder/files/20210922_BE7731EE9AB7E275.pdf
    • http://tongshengchem.com/ckfinder/userfiles/files/94511720360.pdf
    • https://pindimana.in/uploads/file/vonemepo.pdf
    • http://fullcolorspandoeken.nl/userfiles/file/12726043156.pdf
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210924144931.pdf
    • https://dollarplus98.com/images/upload/files/69434163325.pdf
    • http://bc-arman.kz/ckfinder/userfiles/files/21955956012.pdf
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/hutefau918tcp8ijuv243u4155/98053155179.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=cancellare+cronologia+youtube+android
    • 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_off0000b644.bin
345fcf7985a3ef830fd048268f20b30b57c782fa7f9294601d829f8af7887c12		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB644 17188 bytes
font_01_sfnt_off0000e25b.bin
cf1596924bebf7caeaf45afa81b605fe6ed648d20f6b64c5d9359094aa376ea9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE25B 10760 bytes
font_02_sfnt_off0000fb09.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB09 16792 bytes

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