Malicious PDF — malware analysis report

Static analysis result for SHA-256 b66987ce08dba541…

MALICIOUS

PDF

68.3 KB Created: 2021-09-26 04:43:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a00cb6398196697fa617f73ffb6260ac SHA-1: 3c714d0de4fd4e7380517df374671d1fdf6d44d8 SHA-256: b66987ce08dba541e70e25af3bf05f8234e2c650f5c8a56ad45875d4db657485
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://vivekanandbawwa.com/userfiles/file/96018088567.pdf In PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/saligefanadibodiki.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/darupabiborasekiweluma.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210925_52797A0A110F366F.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/64630072540.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/kabinufivip.pdfIn PDF document text
    • http://telektrans.hu/editor_up/zofenegipo.pdfIn PDF document text
    • http://dominopark.pl/public/upload/ckfinder/userfiles/files/96256984309.pdfIn PDF document text
    • http://allineers.netlovestories.com/upload/files/kapigu.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/putewezujofumizuluro.pdfIn PDF document text
    • https://rpaxis.net/userfiles/file/48910157043.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/xovolun.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/7583162672.pdfIn PDF document text
    • http://riviera.az/userfiles/file/gulobaxokibomevozejomik.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/xogojonupaporu.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210917095606333602x09m2i.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16145815d7585d---kezisumazudofurutedajusi.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/74850315285.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/lasedabadudebepesinasaxok.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/80169265946.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/kozujijaritobu.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/lafovafikam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=best+pubg+gfx+tool+for+androidPDF 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_off0000ad66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC578 14792 bytes
SHA-256: 427acadc7ec643c550cf09ae0cff15277782164515b2d6e75493d79e50086a97
font_02_sfnt_off0000ea9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9B 11068 bytes
SHA-256: 50aa240d15a7857cef70020d8add80b20ad919f22ba23bd0bfd729e5f85654d4

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