Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e4e210778cd3d97…

MALICIOUS

PDF

70.2 KB Created: 2021-10-02 13:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5fbeab69f5eb7ec9e53a791179a15713 SHA-1: 67e756c6442bc137b02f97925a48925ee7966702 SHA-256: 5e4e210778cd3d97a79694cfacce38c231a415a019079af761794528f334db9b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable hosting or redirectors, indicating a link farm designed to distribute malicious content or phish users. The presence of external URIs and the overall structure suggest an attempt to redirect the user to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://allytemp.ru/uplcv?utm_term=sites+of+respiration
    • http://podiummoda.ru/userfiles/file/dipaxiputopa.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8c830d3cc---pujedulebudelilakevalowu.pdf
    • http://xdata.pl/app/webroot/img/ckf/files/66716878947.pdf
    • http://kalmi.ru/upfiles/files/20642482130.pdf
    • http://surestegc.org/documentos/file/16662614700.pdf
    • https://rotitelor.com/contents/files/53995368434.pdf
    • http://isotope3.pm-ural.com/uploads/files/17324505010.pdf
    • https://www.abandassociates.com/ckfinder/userfiles/files/xunawota.pdf
    • https://soportedevida.mx/ckfinder/userfiles/files/22876691025.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d834a55811---fovixaro.pdf
    • http://zentrumok.com/userfile/files/bixifetekefipataj.pdf
    • https://securitydm.rs/slicice/file/36225788942.pdf
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/xogeg.pdf
    • http://modulobase.com/userfiles/file/59733348850.pdf
    • http://karlsbach.de/userfiles/files/sokameluw.pdf
    • https://holcom-wd.com/webroot/img/files/26011905863.pdf
    • http://master-sign.ru/ckfinder/userfiles/files/dosexaxiwomise.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1614d74ffbf308---77800732757.pdf
    • https://dortmundpools.com/contents/files/wavalozabukukifid.pdf
    • http://whipitleather.com/userfiles/file/54132969905.pdf
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/92352853338.pdf
    • http://glampingcaravan.com/userfiles/file/20210923115755.pdf
    • http://corising.info/sa_upload/userfiles/file/20210929015827.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_off0000b232.bin
188ee14a964415deeb1999da08a375eaa3b71d5c2d9f7d5bcf11e9555bb86369		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB232 10380 bytes
font_01_sfnt_off0000c9cd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CD 16792 bytes
font_02_sfnt_off0000e1df.bin
5e4c1a6cd3b5d6e0e5753cda85f432d82bbaa260b6262d0b3e5abb26ab2e91ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DF 16368 bytes

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