Malicious PDF — malware analysis report

Static analysis result for SHA-256 e22efc82aa4297e6…

MALICIOUS

PDF

79.8 KB Created: 2021-09-09 12:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c15f89287a1443b92b486a2726aa8e58 SHA-1: 683cb06d48ac42486da0180d3b498db9f0962dc2 SHA-256: e22efc82aa4297e69b8fc9a196532f82492e4abf75edbea7cdad274b31de2284
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number 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. The embedded JavaScript is likely used to facilitate the redirection to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://design-klasse.de/ckfinder/userfiles/files/87632227558.pdf In PDF document text
    • http://langmoon.jp/js/upload/files/kobemalusivaxuvanukota.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/26784049918.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b98830d28---88264364957.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/wimatogok.pdfIn PDF document text
    • http://17njl.com/userfiles/files/medegilesexi.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/jukiwin.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/mixewopikigujelog.pdfIn PDF document text
    • http://thepducphat.com/upload/files/duzatimevimudajadikugalo.pdfIn PDF document text
    • http://health-bridge.in/upload/file/rexiju.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/17339164332.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210902025156.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/94860689738.pdfIn PDF document text
    • http://regcureguide.com/files/files/29418578228.pdfIn PDF document text
    • http://celesteandtorsten.wedding/images/file/futopamanijogufuzowex.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff4b7325fa---35357657757.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/75718139717.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/46701887059.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/29301164657.pdfIn PDF document text
    • http://nwatchonline.info/userfiles/file/58159064785.pdfIn PDF document text
    • https://kamarkosong.com/contents/files/5769482074.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/42918497736.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/74572663055.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=earn+2+diePDF 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_off0000db1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1D 9912 bytes
SHA-256: c95e588890632cc7467aebbf8485b66dd28075115e4ac6aab05b6d0d532c072e
font_01_sfnt_off0000f10b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10B 15916 bytes
SHA-256: a34409ee9ad9007093115b54954fb88f2bb19abcda4f36272da266276fda3519
font_02_sfnt_off000119fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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