Malicious PDF — malware analysis report

Static analysis result for SHA-256 37920df7bf69ca01…

MALICIOUS

PDF

78.7 KB Created: 2021-09-13 05:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d690f0a16931bad451d54e56f557b06d SHA-1: 08317c89e006a8de4f7a4616edce00363b6fdd61 SHA-256: 37920df7bf69ca014a96ed89aab187be3448bead7eba33ccaa0cebed24b74e4f
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, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a secondary payload or phish for credentials. The embedded JavaScript is likely responsible for redirecting the user to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://sahodayabbsr.com/test/fckeditor/file/wokijafulebi.pdf In PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bbe87433d---7986744778.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/nujamedoloju.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/19442996409.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/58576624466.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/timutisiv.pdfIn PDF document text
    • http://aurangabadptti.com/ckeditor/ckfinder/userfiles/files/jabumupa.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/32715225234.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/19237286373.pdfIn PDF document text
    • http://badgerhillfarm.uk/mirupukudituzu.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/84232680866.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/parisasujubuposisugo.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/paxunofuvetokimoketamawon.pdfIn PDF document text
    • https://palet-school.com/files/files/rikaxiwetonulegirolabex.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/2213399297.pdfIn PDF document text
    • http://autofox.lt/ckfinder/userfiles/files/20952421876.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/7502090315.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/89853465935.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f996524e08---delefamavezilosakad.pdfIn PDF document text
    • http://sake-tori.com/images/library/File/10806321201.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/muwetoxapunuz.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/ruwifula.pdfIn PDF document text
    • http://xn--elementy-zczne-kwb98g.pl/media/file/jojutigujat.pdfIn PDF document text
    • https://anakmeong.com/contents/files/35042105247.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/walokeropalikegar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=shooting+balls+game+online+freePDF 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_off0000d089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD089 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89B 16920 bytes
SHA-256: 366ed14da8dafb950cf2c5a9a0f591bfad548b50db8ea1f8d0832122459025c3
font_02_sfnt_off0001146c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146C 10876 bytes
SHA-256: c422fa43db2a599f66326e7fdbdd9327b2a00cd7147138a9d3903790b1cc6a35