Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5692338ea8a6ca9…

MALICIOUS

PDF

87.9 KB Created: 2021-09-24 09:52:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8e7af61ebdd8c552d7de46ed86c68041 SHA-1: 49d501506099b38d78e7da788277fc6af1d93a08 SHA-256: b5692338ea8a6ca98969eaf8f734201c93e286d8a4a63f3708b5435af9773711
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 domains and are likely used for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure malicious links within a large number of redirects. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://catamma.ru/uplcv?utm_term=coolie+no+1+2020+full+movie+watch+online PDF link annotation
    • https://keiba-like.biz/js/ckfinder/userfiles/files/nipofuzugige.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161422841c950c---93617324710.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210902040824.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/8991358919.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/bosupikosibuwerexosi.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/28467369188.pdfIn PDF document text
    • http://ducthai.vn/userfiles/file/tepajovoxemizimusog.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/xifix.pdfIn PDF document text
    • https://vzglavniki.net/data/file/13844023349.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/37896940490.pdfIn PDF document text
    • http://onlinevay.com/upload/files/66935634197.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/zerexodigelakubetogax.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/zuloxoxikerefasozoxuno.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614b81dcbb6b7---79926009782.pdfIn PDF document text
    • https://togelunited4d.com/contents/files/naruwusinijofesupudebejew.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/86526914337.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/repalipitowerupiwudiraji.pdfIn PDF document text
    • https://biocenfis.es/uploads/assets/file/fivizezenefugem.pdfIn PDF document text
    • https://teamcode.net/upload/files/xakeparevemuwu.pdfIn PDF document text
    • http://boki.hu/editor_up/95290527837.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/sowijogolowukeko.pdfIn PDF document text
    • http://asqcert.net/files/files/84544810977.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/xizobumizovagepos.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_off0000f380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF380 10912 bytes
SHA-256: ba89e4b472517a7a9d1b446ab112bbb68a96f01c1ec9fa15d56d3016cd15c6c2
font_01_sfnt_off00010cc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D2 17596 bytes
SHA-256: f6072e18172433ab83fa306ae40b34d4b968913a723f2becb4a5ce4fc5658b36

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