Malicious PDF — malware analysis report

Static analysis result for SHA-256 966aa464594eaa3f…

MALICIOUS

PDF

81.2 KB Created: 2021-10-10 04:34:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8fbb00ce4fd6a03479610d9d1dff733c SHA-1: 2656e4ba7b361480f12961192726ae7ba6289342 SHA-256: 966aa464594eaa3fc79dd6a60b44f6536269d7748c8828b8bbd40f57bfd9e22e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://atem.sciara.eu/public/upload/file/14556649291.pdf
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/vanupukefexare.pdf
    • https://atiksigorta.com/files/firin.pdf
    • http://aolisenjiancai.com/data/files/suzidivetonevilerax.pdf
    • http://radtel-sport.pl/userfiles/file/ritilexefu.pdf
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/84055577396.pdf
    • http://leaders-adv.net/userfiles/file/kusufiza.pdf
    • https://heks-tech.com/app/webroot/userfiles/files/muratabenijaxulo.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6ec289a97---83404180439.pdf
    • http://pogologistics.com/ckfinder/userfiles/files/woruzapoduwirasiremoju.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/65d50059f774ee8539bae014501b1a19/ralukobusageg.pdf
    • https://lesartsdansmonjardin.com/userfiles/file/20210912065401.pdf
    • https://un7un9b3rl1pa7-99.com/contents/files/manetazoliju.pdf
    • https://iwanbim.iwan.co/userfiles/files/92951726868.pdf
    • http://resheto.ru/users_images/fck/file/wonufirulul.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16147f788893a7---77771030759.pdf
    • http://neuroxl.com/images/file/6196966500.pdf
    • http://jandebruijn.com/uploadimages/files/jumanelevuko.pdf
    • http://balbu.eu/uploads/news/file/xowulivafejofedaxetapi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=waive+your+rights
    • 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_off0000d3e5.bin
d90c05ce65ec276bf17b91101b7ff40d1a206506af2cd95dbf524b82f2ee5ebc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E5 10508 bytes
font_01_sfnt_off0000ec08.bin
4f0a74d6c52b27c7fad09f3434289a0a9610318a4a14e5114615f31d8f1c9aea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC08 19360 bytes
font_02_sfnt_off00011f79.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F79 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.