Malicious PDF — malware analysis report

Static analysis result for SHA-256 5967e9042d95bc56…

MALICIOUS

PDF

81.7 KB Created: 2021-09-09 12:34:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c75f1965ee7da5cbc332c9a5d765733b SHA-1: 652711540a692ab120e472504d82a18cd403a652 SHA-256: 5967e9042d95bc563908f4b1c81c162f2b5d800058f03c3508d9348cdaab43b3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it is designed to redirect users to potentially harmful websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports that the document is part of a link farm on disposable hosting, commonly used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://coretry.ru/uplcv?utm_term=sun+tzu+and+the+art+of+business+pdf PDF link annotation
    • http://hawaiisushi.iorderfoods.com/uploads/files/61268478400.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/44646761519.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/dilivuditafexutu.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/biwibumasojuwiv.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/37684474416.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/nixekamevaxowewuxetok.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/sutaloxurisajenivelin.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/68008254712.pdfIn PDF document text
    • http://bayernglobal.de/userVZ/file/misazalob.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/suzefivileluz.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/84890272188.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6d2a931f2---35457655456.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/vesonitefanawubipite.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/9175292834.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/92577508402.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/88277973035.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/josovetedinemewuke.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/sovupopusukuru.pdfIn PDF document text
    • http://trunglamdecor.com/uploads/userfiles/file/14209721946.pdfIn PDF document text
    • http://gajagotour.com/UserFiles/file/79386826519.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/mafimemujozise.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/45833623665.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/xikenapowegodo.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/020248151046.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/23702352335.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_off0000d8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F6 18068 bytes
SHA-256: dc6a99712ca490b1458d3e7411d0824934c93ad8fac9f7c93d1e509ff7ef41c2
font_02_sfnt_off00012034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12034 10924 bytes
SHA-256: f1b4b478518bfb4dfbff08b4ad9160a5fec37c84c88a79f7e116c839e44530e7