Malicious PDF — malware analysis report

Static analysis result for SHA-256 12c978c0d1fa95d1…

MALICIOUS

PDF

69.2 KB Created: 2021-09-26 18:06:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dd06d7ecb3098879d42a0e1e204cc9ce SHA-1: db0d0df83c921125e31f6ad31fb28759a2849c41 SHA-256: 12c978c0d1fa95d12542e5780e1052922fc99d22e4db1ca37ddb043669c6551a
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 numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=android+enable+hotspot
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/kalasikiwaxafejisaduvum.pdf
    • http://dangkydoanhnghiep.org/hinhanh_fckeditor/file/46328166166.pdf
    • http://bytip.net/filespath/files/20210922211349.pdf
    • http://deltools.com/userfiles/file/29271865542.pdf
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/gewibobu.pdf
    • http://jedzenie365.pl/ckfinder/userfiles/files/11592186952.pdf
    • https://bbox.ru/images/shared/file/11734605469.pdf
    • http://wcsps.com.tw/ckfinder/userfiles/files/8095966769.pdf
    • https://tainandentist.com/uploads/files/202109091111191354.pdf
    • http://dreiseengrundschule.de/files/suririmotif.pdf
    • http://stnicholasway.com/userfiles/file/murekamuvoj.pdf
    • https://bakotech.at/uploads/ckeditor/files/powifewuzavakageguw.pdf
    • http://devison-matras.com/upload/file/sizira.pdf
    • http://watdoenwevandaag.nl/upload/29125708371.pdf
    • http://mlsconsulting.net/cms/files/File/podegupiburutupawom.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344c0fdbe4e---67330837277.pdf
    • http://pmke.cz/pictures/files/bafusawatitotawuvijagajoj.pdf
    • http://chukgoobok.com/files/fckeditor/file/luzonalajapo.pdf
    • http://bankerz.in/qpic/files/2293378285.pdf
    • http://fernandopelosini.it/userfiles/files/16056126609.pdf
    • http://freetds.net/userfiles/file/93901662469.pdf
    • http://csc0512.com/userfiles/file/20210907120008_4dxjaj.pdf
    • http://nikolabartakova.cz/files/file/nopavoluwuneravofa.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/7432f0e0bfb0f945e6f70c63b51df1a2/61469632236.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_off0000b261.bin
8bd37d7d80036ad13cbe493059517a25a9624b1827be0180845e98883cc2143d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB261 14548 bytes
font_01_sfnt_off0000d6f9.bin
4a6b40419219bfcfffcc2ff16b35a5ce3a6ef1227ceaaca7e419e7ab7c12eb44		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F9 10612 bytes
font_02_sfnt_off0000eeec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEC 16792 bytes

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