Malicious PDF — malware analysis report

Static analysis result for SHA-256 677f492eb77063f4…

MALICIOUS

PDF

80.8 KB Created: 2021-09-19 23:18:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4ca27899ee67e5f0e79b1918a2f5e908 SHA-1: aa6cba5d5d53d09acf39f65e554894e22d94f466 SHA-256: 677f492eb77063f4ae7be34e69b5a4fb24f8051d05fbe86709b7e0686d1f7f6c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Numerous embedded URLs point to potentially malicious or phishing sites, suggesting an attempt to redirect users. Although no scripts were explicitly extracted, the PDF structure and the nature of the heuristics suggest it may contain embedded JavaScript or exploit code to facilitate the redirection.

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 http://archinfo.ru/uploads/file/gunasunumanepuliwunelu.pdf In PDF document text
    • https://kebecelectrique.com/upload/editor/file/63780559865.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210918_063033.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/61611311071.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1614053e827520---jimabupufovereji.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/60056816637.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/40063436304.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/72666204648.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/87820407999.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/447c163db75c39f24c423e14f0a7a95d/38933434020.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/tovuvamal.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/79094177881.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/92341159623.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/55372558531.pdfIn PDF document text
    • http://rescue119.org/userfiles/file/nevumunipexenunejadu.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/dopenipefajevotak.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/natojidewoninifa.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/88889924830.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/xepovojitapedebafa.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/d5ad32af1938a5bd5a6439ea29098f1c/kibekamiv.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/libalezixuvobufipud.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/jebug.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/rowakobapalunixuzudaxabo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=frp+6+bypass+apkPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E1 10144 bytes
SHA-256: a3f03dc4247a800c5bc70dcb5021eb19061b66e2a5f960dd458fcfd25270518f
font_01_sfnt_off0000eb6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6C 19432 bytes
SHA-256: 58b36e7db46fb2667064d685d5b889f864b080ec2cf5f5da88dac67774d22ab5
font_02_sfnt_off00011dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1