Malicious PDF — malware analysis report

Static analysis result for SHA-256 7efeb248acb29e14…

MALICIOUS

PDF

79.9 KB Created: 2021-09-10 21:11:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 64c909a027f7a2f0f7457bde1a4a9e98 SHA-1: 10a0a5aa35a2004a639d434bc14790077066df5d SHA-256: 7efeb248acb29e14de356cb76aefe044cfea6e7b4c004c109698ae1f664f4a54
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The sample also exhibits characteristics of a link farm, with numerous external URIs pointing to potentially malicious content, suggesting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yevres.fr/ckfinder/userfiles/files/dexagagamuwu.pdf In PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/bumubewekado.pdfIn PDF document text
    • http://srub-servis.ru/userfiles/file/87500294435.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/7999729921.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/63063334810.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/savuduxarebunojebalon.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/84832578879.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/mafeluki.pdfIn PDF document text
    • http://sinsg.com/files/fckeditor/file/sufevubodebege.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/a26d1cc8b9e35ea74e771f279c06b471/18869029624.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/kafuluruxuzu.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/berijirapar.pdfIn PDF document text
    • https://anaksemut.com/contents/files/zunokoridunaxikifodeb.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kimawaburutezaju.pdfIn PDF document text
    • http://digifast.cz/userfiles/87462561758.pdfIn PDF document text
    • https://bonaparte.cappencms.com/templates/files/63502371896.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210908_133602.pdfIn PDF document text
    • https://egf.tw/test2/images/file/29186957792.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/gozuke.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16139564828e57---bomedunafonan.pdfIn PDF document text
    • http://vswet.ru/f/xapelidebigizevoko.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/86095832151.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=disable+message+blocking+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_off0000d0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0EC 18860 bytes
SHA-256: cef4c110570111d3cb6732726c671cea7099c42ecbdd7eb98bfc0a020f092554
font_01_sfnt_off0001019d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B4 10848 bytes
SHA-256: 08c2dd528c2f22547c2ec7790252d1ba7edf03ca6a230568fc6a1649564f5875

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