Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5b73396a7ed563b…

MALICIOUS

PDF

86.5 KB Created: 2021-09-19 08:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2d4d9307363bb690f7c0bd375f0ec4a6 SHA-1: 9cb4208cb3785e67d68f191544d7500d44734517 SHA-256: d5b73396a7ed563bd0f7383d8c5a05a04c8ad3d0e7a4647182b6b43f109fa968
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea of a link farm designed to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://economiadecomunion.net/ckfinder/userfiles/files/tutuzoba.pdf
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/2185753423.pdf
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/27194547653.pdf
    • https://ooo-kenk.ru/userfiles/file/wikomumimo.pdf
    • http://opusbiz.kr/data/editor/file/7630148936145dc671baca.pdf
    • http://fitviewer.biz/files/file/lugitemofevijuke.pdf
    • http://classtool.info/upload/files/95715178798.pdf
    • http://sungsam.net/userData/board/file/xarifareku.pdf
    • http://volkshilfe-ktn.at/images/content/files/niwifovavamif.pdf
    • https://magyar-logyogyasz.hu/fileok/file/zarugizakomevalana.pdf
    • https://acavacecio.it/userfiles/files/fatiribesus.pdf
    • http://kimhoatra.com/upload/fckimagesfile/85918529098.pdf
    • http://juentai.com/userfiles/files/kajawovagotiwosimupaxop.pdf
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/92426947506.pdf
    • http://onishi-kyosendo.jp/archive/fimejobij.pdf
    • http://kyea.org/imageuploads/277463518.pdf
    • https://art4you.sk/editor_uploads/system/files/67406633585.pdf
    • https://chatsystem.site/js/ckfinder/userfiles/files/94036347190.pdf
    • https://textolinguisticsolutions.com/upload/editor/file/64652755843.pdf
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/xejonidozesaputip.pdf
    • http://tiszaikaland.hu/upload/file/timebebukefuvozejewemuwi.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/555a61120806298a9e379ccbd66d5e73/jiximatizutofex.pdf
    • https://francemonde.news/UserFiles/file/jofosupufenake.pdf
    • https://adetexfoamgroup.centralcms.cloud/galeria/files/44184044335.pdf
    • http://shengyaweb.com/uploadfile/file/2021090608015851.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/m0r2sjs7i9c03oecf7i2k629j8/rufafuwusuzovifez.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=www+tubidy+mp4+music
    • 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_off0000e267.bin
c5f961dd91d2fdc5b933db0e7e09333e511c2ef864ce4c2f49278c02012214bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE267 21432 bytes
font_01_sfnt_off00011c23.bin
b6b56b6ed49d01298cb4d9159d64615844bbeeba1bd8c39079f451bff529e8ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C23 10520 bytes
font_02_sfnt_off000133fc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x133FC 16792 bytes

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