Malicious PDF — malware analysis report

Static analysis result for SHA-256 3214c98502f4dd43…

MALICIOUS

PDF

89.0 KB Created: 2021-09-18 19:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c29798ed73bc055667add6e7ef9be295 SHA-1: ef26d1beb52224e37d226349b9f4f4f22b28b8d3 SHA-256: 3214c98502f4dd43216c7f31e1a63bfd24d02f846001914ded27199c871178ab
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to potentially disposable domains, suggests a link farm designed to redirect users to malicious content or phishing pages. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://gibidesign.com/fckfiles/file/kavozesumalesesixaz.pdf
    • https://speculatio.in/userfiles/file/12552163010.pdf
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/79373313861.pdf
    • http://vodova51-53.cz/files/62224952352.pdf
    • http://proficlim.ru/public/userfiles/file/56010537626.pdf
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/32290605386.pdf
    • http://lingeriedediva.com/UploadFile/file/2021090807324673499.pdf
    • http://residencelesaline.it/userfiles/files/81156592454.pdf
    • http://auswallendorf.de/userfiles/file/zejajatekilalogadorumow.pdf
    • http://drentmedischadvies.nl/uploads/files/36347042249.pdf
    • http://kiuanai.com/userfiles/file/sonogotosutenun.pdf
    • https://shibbirs.com/media/files/lewisunuvimuvozubozuna.pdf
    • http://quangcaovuanh.com/vietkiendo/upload/file/fukigifosanexikaxarun.pdf
    • https://self-storage.sg/images/uploadedimages/file/jitimagakuta.pdf
    • http://snabsz.ru/ckfinder/userfiles/files/48758544810.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/0a4cd557f181f65ef7e7e39277cd49e3/rizoza.pdf
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/60031459404.pdf
    • https://usgcambodia.com/userfiles/file/nuvubeterufofirudaso.pdf
    • https://clifestyle.net/uploades/userfiles/file/95148542994.pdf
    • http://elskup.pl/images/assets/file/34310181951.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/tcvu0e3r8u9al7fvqbrhj8sba3/vatarozigov.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=packet+sender+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_off0000f55f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF55F 16792 bytes
font_01_sfnt_off00010d71.bin
1589df83325d2c3dd4c595f25896153957935b907850c6eb728e69d7c3b56e3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D71 19024 bytes
font_02_sfnt_off00013e91.bin
ffeaeb29b124aab5c952e85f05569fe881a5bfcf66d2ef9ff43ee0a5ea8ca29b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13E91 10412 bytes

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