Malicious PDF — malware analysis report

Static analysis result for SHA-256 799f11a1c5aed1d9…

MALICIOUS

PDF

83.8 KB Created: 2021-09-19 07:14:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 96e5219105c8075fbbe314ebb2588468 SHA-1: e66386b1402f174dcdd8efac5f7acb63ccded0c4 SHA-256: 799f11a1c5aed1d93a6abe7b7f1398eef5f4c712e4a7ed68ddc1cfa3f48d222b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, 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 responsible for initiating the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 https://nomylo.ru/uplcv?utm_term=roger+waters+the+wall+live+in+berlin+record+store+day
    • http://classiccar-jp.com/js/upload/files/23887721939.pdf
    • http://kidsjeodo.com/images/files/dasavetokasabuki.pdf
    • http://aviafond.ru/userfiles/file/demigi.pdf
    • https://marblobaths.ph/app/webroot/img/files/sepodotulokuko.pdf
    • http://goodfortune.hk/UpLoadFile/file///kudubukeketuri.pdf
    • http://eviljoy.com/UserFiles/File/fimixo.pdf
    • https://cepatdaftargroup2.com/contents/files/buzofusefifin.pdf
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/98383226339.pdf
    • http://dymenahealthcare.com/upload/fckeditor/file/48690393396.pdf
    • http://artdental.hu/editor_up/welunuterasukuvajufuxolu.pdf
    • http://xn--oy2b9bv81anouola.com/upload/file/202109181808221284.pdf
    • https://www.prshots.com/ckfinder/userfiles/files/texejixiravajako.pdf
    • http://vxclouds.com/userfiles/file/depewidariwatij.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613556522356c---fotolafelenarizaken.pdf
    • https://bahceneryaman.net/public/content-images/files/xepujijemevirokutibe.pdf
    • http://eggtesting.com/admin/uploads/file/gurosixu.pdf
    • http://hotdeals24x7.com/ci/userfiles/files/44903300362.pdf
    • http://geomanteia.com/userfiles/files/80698422108.pdf
    • https://fq.ua/images/file/87567844206.pdf
    • http://geoplan.su/userfiles/file/karozi.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613f801d7195c---73635725078.pdf
    • https://sproname.com/files/userfiles/files/99165423807.pdf
    • http://darec.sk/files/files/40196989970.pdf
    • https://insinkerator.us/images/uploaded/file/66788120608.pdf
    • https://1tlstar.com/storage/uploads/files/duripizifabibimepebunu.pdf
    • https://xyoaa.org/sites/default/files/files/xivabemuw.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da8c.bin
957d364a2f002d93972f932659996bd91c31ddb8a4de754f4cccb6c799494a20		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8C 11100 bytes
font_01_sfnt_off0000f440.bin
f5d3ef549e853a0f6f7e9313ce01e8ce458652b36cfc2682dbce399286dc7781		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF440 20132 bytes
font_02_sfnt_off00012936.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12936 16792 bytes

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