Malicious PDF — malware analysis report

Static analysis result for SHA-256 98348364d720195a…

MALICIOUS

PDF

74.9 KB Created: 2021-09-15 23:26:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 524691d8d5d02c19485aae491fd317b4 SHA-1: e46f9468f8fe9d68061c64222b411625a92c05b0 SHA-256: 98348364d720195a852c11f39de092a98743b3f4c4efdad5fe3762e3bd12a770
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also functions as a link farm, directing users to numerous external URLs, many of which are hosted on disposable domains, suggesting a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection or execution of malicious content from these URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5898

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.
  • 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
  • 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=advanced+pdf+to+excel+converter
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/voxujixifetugorukumi.pdf
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/8803753986.pdf
    • http://groupkaishan.com/d/files/51886416976.pdf
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/53294182441.pdf
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/girudenobisezadub.pdf
    • http://bbbo.handyfriendship.com/upload/files/vimodug.pdf
    • https://oncallanatomist.org/ckfinder/userfiles/files/xorogu.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350fce8e767---5311359396.pdf
    • http://lecieldesandes.fr/ckfinder/userfiles/files/11242996192.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ee4069fe8---zowubapuzafadibujusu.pdf
    • http://3bbb.fr/ckeditor/upload/files/nipefutesagapuroxobimujos.pdf
    • http://techscreening.com/userfiles/files/negabuvu.pdf
    • https://doan295doson.vn/namthuan/images/news/files/10124284064.pdf
    • http://iccj.jp/images/uploads/fckeditor/file/zejuneralozodowujibud.pdf
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/71414741569.pdf
    • https://ecotranslation.ca/upload/editor/file/34689390407.pdf
    • https://cpc-serbia.org/js/files/junorovefizof.pdf
    • http://liveranigioielli.it/userfiles/files/redupifuraroko.pdf
    • https://ispartaprefabrik.com/ckfinder/upload/files/walesi.pdf
    • http://wideanglepackaging.com/ckfinder/userfiles/files/9357563529.pdf
    • https://iveducentar.com/uploads/assets/file/41831576138.pdf
    • https://highlander-inn.com/assets/userfiles/files/19477162943.pdf
    • http://evaemlak.com/userfiles/file///nitovutomuzumadobezudivi.pdf
    • https://ciela13.leaddeehub.com/userfiles/files/veduvulaxova.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d51e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD51E 16792 bytes
font_01_sfnt_off0000ed30.bin
ac0c7fd819991380c7c45133c595396c6152a1a84e1bfa611b66db697d10742d
pdf-font-stream PDF embedded font (sfnt) at offset 0xED30 18132 bytes