Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bcdf69756b05d43…

MALICIOUS

PDF

74.8 KB Created: 2021-09-24 11:22:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 97b16c2d0d1d8872411359c34305e9a3 SHA-1: a0ec058e850d594470e2750fc3fbfa1209f2daca SHA-256: 5bcdf69756b05d43e948a38db0d452010f60576f6ae49008d25a696ee1c037b6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high density of external links, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=8+ball+pool+apk+unlimited+coins+and+cash
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137a14e617a5---41571030321.pdf
    • http://brcassociati.com/userfiles/files/rasajupebajizizeliveba.pdf
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/4561752210.pdf
    • http://konferencii.org/js/ckfinder/userfiles/files/87945891528.pdf
    • https://palezieux.com/ckfinder/userfiles/files/71296871587.pdf
    • http://hosungtour.com/FileData/ckfinder/files/20210924_D13711903F7B6EC5.pdf
    • https://itchanoi.vn/uploads/news_file/92901755356.pdf
    • http://inbond-cn.com/userfiles/file/zufemibesomoserot.pdf
    • http://asclyziarskyklub.sk/userfiles/file/puralevuwurutaso.pdf
    • http://monthclean.com/uploads/files/202109222311217471.pdf
    • http://rowerowaszkola.pl/imgturysta/files/dodelenizoxesadurusego.pdf
    • http://fongyoskert.hu/userfiles/files/gugarotik.pdf
    • http://aeusjtu.pretty-match.com/upload/files/futopebugaf.pdf
    • http://tk-weld.com/images/library/File/bituditulukenova.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d3f62f247d---vejixemalo.pdf
    • http://koszyczarek.pl/userfiles/file/90402520614.pdf
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/dojurepifadidugevofumaku.pdf
    • http://patrick-vallot.com/upload/files/naxebakike.pdf
    • http://namngonviet.vn/user-/files/vegoru.pdf
    • https://hongmao.tw/uploads/files/202109222120182291.pdf
    • http://fratellibeninca.com/images/file/19062642009.pdf
    • http://espressobuilders.com/app/webroot/files/userfiles/files/85225318639.pdf
    • http://80tner.friend-match.com/upload/files/6223097777.pdf
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/20018299066.pdf
    • https://www.assofmt.org/ckfinder/userfiles/files/22205601737.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_off0000bf8e.bin
809a86ce57f9f368937cf14911bae62dd9df98a5e280a2daf1b8c2df402e47b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF8E 11120 bytes
font_01_sfnt_off0000d90c.bin
b745efe6587615c21abe517683b23f092ce340d62d8cdb85035f66c0fd581513		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD90C 17212 bytes
font_02_sfnt_off00010534.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10534 16792 bytes

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