Malicious PDF — malware analysis report

Static analysis result for SHA-256 2998c1cb7437e6a1…

MALICIOUS

PDF

70.6 KB Created: 2021-09-12 02:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fc94aa55f3dea1da949c49417249fac3 SHA-1: fc2d3bb6167e4dc3eec92428c39a4cf92cfc8bd3 SHA-256: 2998c1cb7437e6a12c7aa870181cc1c72845756a64962aaaa6b78013f3a75b97
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and multiple external URIs, flagged by ML and ClamAV as malicious. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates it functions as a link farm, likely to distribute phishing content or malware. The embedded JavaScript (T1059.007) is a common mechanism for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://garglob.ru/uplcv?utm_term=droid+web+cam PDF link annotation
    • http://mcap.cz/images/uploadedimages/file/53177494203.pdfIn PDF document text
    • https://soenen-pneus.com/upload/file/mejuwabigo.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/50551826655.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/15158382681.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/10629925485.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16130b1287f7d7---lonuzuji.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/31838449012.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/lovugufeveba.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/bamibetema.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/21733036862.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/renuwe.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/kulivutovafujipi.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/f84r33o2b2o0hu0660v1hjt154/22483225159.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109081949174358.pdfIn PDF document text
    • https://nileagriculturalindustries.com/file/5497107639.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/72277166023.pdfIn PDF document text
    • https://zlato-stribro-investice.com/upload/files/zimopoxifa.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/bojuwagavazarajanovoraxi.pdfIn PDF document text
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/15082854935.pdfIn PDF document text
    • http://togul.org/sites/default/files/file/65883667102.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/jipomomemolopob.pdfIn PDF document text
    • https://izometal.net/mm/file/96929249998.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/vimusurunupisuf.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/tevob.pdfIn PDF document text
    • 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_off0000b6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF08 10340 bytes
SHA-256: b2939617de19864cb50c6c4c8ba25d9504988a647839087b4874ba58c9400c8e
font_02_sfnt_off0000e666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE666 15280 bytes
SHA-256: 56acc3872d59ebb615cadbd626e900d3effa3ab7d3ecea92371c163e6a732852

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