Malicious PDF — malware analysis report

Static analysis result for SHA-256 3536ed82e85641dc…

MALICIOUS

PDF

73.5 KB Created: 2021-09-17 07:30:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0732616e39b8e979073e3fb086665fa7 SHA-1: 1c4ddf091afcc0bb65a97b8632e404cc12c9bc4c SHA-256: 3536ed82e85641dc43a8dd9b8848f3deadf86faac34646354a49edf29e5830d1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, with a high ML classifier score and ClamAV detection indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is part of a link farm, pointing to a phishing or malware distribution scheme. The embedded JavaScript is likely used to facilitate the redirection to these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://czdashan.cn/uploadfile/file/2021090223460473499.pdf
    • http://preiss.at/upload_files/files/vidozenapazexil.pdf
    • http://rracc.com/file_media/file_image/file/42297659300.pdf
    • https://5ky13lu3-1251.com/contents/files/44640249760.pdf
    • http://www.patriarca-batiment.com/ressource/site-image/files/gobixotozavaku.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161377d00830bf---70684971976.pdf
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/46378374996.pdf
    • http://propack-th.com/image/upload/File/97090484827.pdf
    • https://kfk-dekoration.dk/images/uploadedimages/file/ruvebagemafep.pdf
    • http://chickendaylacrescenta.com/uploads/files/7551575789.pdf
    • http://santeh.md/img/files/1399740816.pdf
    • http://suamanhinhlcd.net/userfiles/file/zapedilezogifi.pdf
    • https://eprobatdz.com/ckfinder/userfiles/files/lexevumixodofu.pdf
    • http://seamcc.com/UserFiles/files/nadotaponifevobe.pdf
    • https://surupaceanu.ro/ckfinder/userfiles/files/93324486477.pdf
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/tojamawesusabupevareju.pdf
    • http://manpukuorder.com/uploads/files/loworitawozegepofameg.pdf
    • http://louisamerino.com/userfiles/file/9413448380.pdf
    • http://stjconsulting.it/userfiles/files/zefugogizupe.pdf
    • https://europawindow.com/app/webroot/img/main_content/files/2962488018.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=what+are+the+main+rules+of+basketball
    • 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_off0000be96.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE96 16792 bytes
font_01_sfnt_off0000d6a8.bin
a7aa51da3f6b64611bcc6672648ba5681bc104d5bcd336a34962ddcaa347236e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A8 16076 bytes
font_02_sfnt_off0000ffa8.bin
f321edf8f02702e35ab14b3f45778ff91431638cb168f335456a8d02edb5a83f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA8 10804 bytes

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