Malicious PDF — malware analysis report

Static analysis result for SHA-256 15cf40a5d86e472e…

MALICIOUS

PDF

87.7 KB Created: 2021-09-10 11:04:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8db08a3a79a619de2f97475d1a51fe3e SHA-1: 109e9299cf1a4ec33df537f3d8cfb17fcd1a9ad6 SHA-256: 15cf40a5d86e472e934b967da3e15118e3b950be426ce2715f51d043efda77ae
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting, characteristic of a link farm designed to redirect users to malicious sites. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM further supports this, indicating a deliberate attempt to obscure the final destination through multiple redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://inwebjor.ru/uplcv?utm_term=redmi+9+call+settings
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613519d8a5d4c---zixefozaza.pdf
    • http://nissanotogovap.com/uploads/images/files/lofafupitudijirupes.pdf
    • http://dokturmice.com/ckfinder/userfiles/files/vojajofetesivagomagawipu.pdf
    • http://brbud.pl/userfiles/file/24887503030.pdf
    • http://krevue.cz/UserFiles/File/74738533868.pdf
    • http://trip-sale.ru/userfiles/file/6830576119.pdf
    • http://danies.ru/ckfinder/userfiles/files/ganipofenalada.pdf
    • http://turinimoti.com/assets/userfiles/file/60623359731.pdf
    • https://htcpost.vn/vietpost.vn/img_content/file/22593235368.pdf
    • https://topclassgreenery.nl/images/file/zibetuxosawes.pdf
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/8616755413.pdf
    • https://novahealthclinic.ca/userfiles/file/269450058.pdf
    • https://atvatextile.com/upload/ckfinder/files/dubiwawubar.pdf
    • http://kosmonautika.ee/ckfinder/userfiles/files/vegakutore.pdf
    • http://www.bash.cl/media/file/42727194390.pdf
    • https://haisanquangninh.org/data/dulieu/files/kabikoxubobojoxazikekuj.pdf
    • http://styrexon.cz/userfiles/file/benumazasome.pdf
    • http://pulsarvn.com/media/ftp/file/xegajobe.pdf
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/nagolazigaxarimekut.pdf
    • https://2ruoteexpo.it/ckfinder/userfiles/files/53616804856.pdf
    • https://ln80.cn/filespath/files/20210903120443.pdf
    • 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_off0000f173.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF173 16792 bytes
font_01_sfnt_off00010985.bin
a046bfad29b48e190f1e564ac435a79ef6d886b1fff04ebba5ae8992fc169b0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10985 18820 bytes
font_02_sfnt_off000139aa.bin
31ed36544001d1c831ad62ef80c9cf2cd9d924f1eba902837f04b3f6e05545a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x139AA 10704 bytes

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