Malicious PDF — malware analysis report

Static analysis result for SHA-256 97cd75ed26c04b1f…

MALICIOUS

PDF

74.0 KB Created: 2021-10-02 13:58:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1090fbe2d37a8c9f5b02f41f54fef6d5 SHA-1: 954cbcd5b48915100fa9c325a607ead79a01758d SHA-256: 97cd75ed26c04b1f8b9e8cd4aa0a37b05b13180b40d006fc4565aa733ab2fc3f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to unknown external domains, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this by indicating a link farm on disposable hosting, commonly used for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://coaching-jk-academic.com/ckfinder/userfiles/files/20518458005.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae7b463ee4---mokirotekuvetoxiwuzaxima.pdf
    • https://brianspradlin.com/userfiles/file/zapodixe.pdf
    • http://vuason.vn/upload/files/kijifaxa.pdf
    • https://dpengineerindia.com/admin/userfiles/file/bifodamanajotu.pdf
    • http://zoop-tech.com/ckfinder/userfiles/files/2111887829.pdf
    • http://bptramptour.pl/files/file/10041109709.pdf
    • http://sowa-architekci.pl/userfiles/files/vineroz.pdf
    • http://pronobile.de/catalog/file/xozokitan.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/m8kc0njt22i5vcc84atbgnit7f/xunojifafuwu.pdf
    • http://www.addvanceo.info/userfiles/files/50270521731.pdf
    • http://eksternest.be/images/file/jagifokorokalaz.pdf
    • https://stratasphere.online/userfiles/file/80626185445.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16143693ac6830---vujumepabo.pdf
    • http://dichvutheapec.com/upload/FCK/file/115268946.pdf
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/26724742649.pdf
    • https://network-italia.com/file/xojirinerajisowodefa.pdf
    • https://cheesykeju.com/contents/files/9364913445.pdf
    • http://areawifi.com/DESARROLLO/userfiles/files/65815906099.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=undefined+symbols+for+architecture+x86_64+c%2B%2B+mac
    • 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_off0000b280.bin
777245d0ea41a79d33b4372515fe923c9edb81f1040edfa3e69bd8ff8bb32223		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB280 11688 bytes
font_01_sfnt_off0000ce3e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE3E 16792 bytes
font_02_sfnt_off0000e650.bin
eb99affba68e165032a9ab08f52e3c6014941abd38c8105cb896d50d4cc3c752		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE650 20052 bytes

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