Malicious PDF — malware analysis report

Static analysis result for SHA-256 681a18dc4cbf909f…

MALICIOUS

PDF

96.8 KB Created: 2021-09-16 19:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5d4ca3b1f2cebd54ef3242f6c7743ae8 SHA-1: d4a3adb9b9d87cb8df96a2ada0824bb604a97a46 SHA-256: 681a18dc4cbf909fa9eac3c143b0f5daef6b6a966005ef8025c9de00e53d3ac5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a high likelihood of this document being used for phishing or to redirect users to malicious sites. The embedded JavaScript likely facilitates the redirection or further exploitation, contributing to the overall malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rafut.pdf In PDF document text
    • https://foodvellythailand.com/upload/files/joxaduvuxumewuli.pdfIn PDF document text
    • https://digireg.org/upload/lozewidekupewibumizu.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/zapavokawina.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/ruxexopurowa.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/12637312174.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/28323656213.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/89968969525.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/11007472966.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/6a78790fbe5aa0ad2cdc76189c5cc03d/48975137120.pdfIn PDF document text
    • http://liceoadultos.juniorcollege.cl/userfiles/files/pexovaposobiterog.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/68077249753.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/rizibaliwule.pdfIn PDF document text
    • http://mgbig.com/upload_fck/file/2021-9-2/20210902205651457130.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/nifagugokabajadex.pdfIn PDF document text
    • http://anduong-nhatthanh.com/uploads/news_file/vovumekaga.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e55978fd8f---kexowimaxixilirafi.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/91123100726.pdfIn PDF document text
    • https://jagamimpi.net/contents/files/bususaxibejokaxo.pdfIn PDF document text
    • http://mrcookie.tw/upload/editor/file/032219579797.pdfIn PDF document text
    • https://vinaarc.com/app/webroot/files/ckfinder/userfiles/files/34815351842.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/liporefuvivazupupepesit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=123movies+to+go+toPDF 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_off00011368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11368 19432 bytes
SHA-256: 050a687bb5e1d75763388a1d1885c4c5b350b852dc301a5ecf10fdd2abb534a4
font_01_sfnt_off0001463e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1463E 10352 bytes
SHA-256: b3f2ed02acb29a37f93ad39dd4b9a1eb83614bdf43f05eb79ede30e6962f6d07
font_02_sfnt_off00015dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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