Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad76e5e4cfdb121a…

MALICIOUS

PDF

81.7 KB Created: 2021-09-22 12:38:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4aa2e4d37c10d8a93e6cd75875ad73b6 SHA-1: 5898a983b108856301350a35a9746ea61d9154b6 SHA-256: ad76e5e4cfdb121a8a3de5d2ac22fa7f45bbd5e258fc0c388194e203aadbf5d2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, with one specifically pointing to a URL containing 'uplcv' and a search term, suggesting a phishing or malware distribution lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host many links on disposable domains, further supporting a malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links strongly suggest it's part of a phishing campaign or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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=plants+vs+zombies+free+play
    • http://nhakhoauytinhaiphong.com/upload/files/23683165152.pdf
    • https://fairtradeportal.pl/userfiles/file/xusetokesapajazuxeb.pdf
    • https://bd-sokolovska.eu/userfiles/file/melomav.pdf
    • http://belgium-ex.com/images/blog/file/rijaf.pdf
    • http://kamkmori.cz/ckfinder/userfiles/files/80877129130.pdf
    • http://harchovyk.com/userfiles/file/12613890519.pdf
    • http://ctyrkolky-gamax.cz/data/dokumenty/97227661149.pdf
    • http://tokyo-sanritsu.com/userfiles/file/xepunipewelene.pdf
    • http://watchimport.eu/userfiles/file/fejuva.pdf
    • https://fleschimmo.lu/userfiles/files/mapoxubifaxuniduzoraxi.pdf
    • https://ikansambel.com/contents/files/20429022196.pdf
    • http://autolavaggiocraparotta.it/userfiles/files/85646295721.pdf
    • http://fcraregistration.com/UploadedData/file/87531282600.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb0c062def---88702938897.pdf
    • http://cdmvt.cz/sites/default/files/sirajesojuma.pdf
    • http://chanhungcorp.com/images/uploads/files/golitugojovijumunelo.pdf
    • http://mingmitrcoffee.com/user_img/files/jepatixasi.pdf
    • https://powermailer.in/userfiles/file/giredumifenebubaleweg.pdf
    • https://sadhankendra.org/erc/media/74422099745.pdf
    • http://freewest.at/nodawik.pdf
    • https://kluchar.net/klucharnet/images/file/1820828055.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/1814183b277ec3970df1d59d5a0ea4f6/58265865984.pdf
    • http://perfecturology.cafe24.com/upload/editor/imagefile/gitim.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_off0000db41.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB41 16792 bytes
font_01_sfnt_off0000f358.bin
cb13eee67f75b697d3bc2fc6142247aec5af028e4590eee6807a92d49e37bfc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF358 10900 bytes
font_02_sfnt_off00010c70.bin
ebd000851e094f56abcdebb3734146c32757a92da6a28df8df73a75715dcba48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C70 17008 bytes

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