Malicious PDF — malware analysis report

Static analysis result for SHA-256 d468eeab74679582…

MALICIOUS

PDF

87.6 KB Created: 2021-09-12 12:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 547c51cafadad7fde80b7e0adf4f0c75 SHA-1: 5cf5b3fe2bf36a66a9655256ea7bae18bf534763 SHA-256: d468eeab746795826411e11ead7fb6251dda22380094ee61332a3f91103388b0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and the numerous unknown URLs suggest a link farm designed to host or redirect to malicious content, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://backkwang.com/userData/board/file/xoripexexixuwog.pdf
    • https://classoft.ro/userfiles/file/36946333474.pdf
    • http://1666-3668.com/attach/userfiles/file/jirekuzoxelenebosoz.pdf
    • http://prochem.vn/images/uploads/files/84199770377.pdf
    • http://pitin-akutsu.com/js/upload/files/51669635207.pdf
    • http://chistogood.ru/admin/ckfinder/userfiles/files/72531555751.pdf
    • http://futimisdev.com/userfiles/file/defimu.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/38f4a88ba8202e579fc2c10396d135c9/22083977160.pdf
    • http://gocoachfox.com/userfiles/file/nirazetowedupokosemu.pdf
    • https://alaskaproauto.net/nbloom/fckuploads/file/mogugudujezamud.pdf
    • https://mogilew.ru/userfiles/file/46420708858.pdf
    • http://studioriboldi.eu/userfiles/files/83851952539.pdf
    • https://lederstuhlshop.de/ckfinder/userfiles/files/nonuponikowexepuderif.pdf
    • https://hongmao.tw/uploads/files/202109111531447202.pdf
    • http://boldino-hotel.com/ckfinder/userfiles/files/gizewulogudo.pdf
    • http://bbbo.handyfriendship.com/upload/files/72354793939.pdf
    • http://circuitvietnamcambodge.com/hinhanh/file/75695971681.pdf
    • https://vanrun-it.nl/userfiles/files/55331196871.pdf
    • http://campingwithconvenience.com/files/files/nubugux.pdf
    • http://automsystem.com/UploadFile/file/20210905100833066.pdf
    • http://itkaufmann.com/images/fckimages/file/35145564075.pdf
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/56271637235.pdf
    • http://jumpinfit.it/userfiles/files/5529022327.pdf
    • http://sinosteelcode.com/filespath/files/20210907225239.pdf
    • https://transmar.biz/ckfinder/userfiles/files/punurotapigifabomoxideve.pdf
    • http://abwcrainhwy.com/uploads/files/60362840366.pdf
    • http://gomsuhoangminh.com/app/webroot/uploads/files/maxudodulisajurerejizud.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=advantages+and+disadvantages+of+android+and+ios
    • 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_off0000f3f1.bin
50273c47c097f6aee2668ced8d012df6e1a2363ec38ba03ae454b333cd0db5b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F1 17200 bytes
font_01_sfnt_off000120a2.bin
769c5ada163f2a824973ca83fa873dc5d31ac12ecd6c37278271d57f176457f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120A2 10528 bytes
font_02_sfnt_off0001389c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1389C 16792 bytes

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