Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbcc66025c2165be…

MALICIOUS

PDF

79.9 KB Created: 2021-09-11 14:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 797e70d36be2ccf90c9c308f32b06ee6 SHA-1: 30a0936a0fd553532ccf3ae40d9f4b7a66862170 SHA-256: dbcc66025c2165be8fe586eadc238725060042776c2469e5ea2bb4a4c2041e9a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites, which are used to host further malicious content or phishing pages.

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 http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613171b73cdc0---tonomiga.pdf In PDF document text
    • https://facades-et-traditions.com/actualites/file/46793510123.pdfIn PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/pufepi.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/72109583769.pdfIn PDF document text
    • http://zae.me/datafiles/file/zepotetonewekoganu.pdfIn PDF document text
    • http://inphuduong.vn/upload/files/33635051865.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/4a222b159bf93dff5ab74ddfc950f309/zeraguf.pdfIn PDF document text
    • http://albertf.madteam.net/ckfinder/userfiles/files/nukomujeretukule.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/fojawixenisotizekisigade.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/kugenumovokuvobubafudeso.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/ronavala.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/32213737330.pdfIn PDF document text
    • https://carlojans.com/cms/file/dolewumotetimugu.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/60872333400.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/nasewosaleki.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/vovafilixegezeru.pdfIn PDF document text
    • http://trieuduong.com/images/Download/36528822741.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/belolodaterilikar.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/29019426526.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/budegulel.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/70548955339.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/guzugawuvufemexope.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/robobuzenada.pdfIn PDF document text
    • http://uteambio.com/upload/files/wirodisaliwumidubaxivare.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/padogujo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=virtual+xposed+for+androidPDF 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_off0000d3ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3ED 10660 bytes
SHA-256: 1771160583e5aa4c7baffda5825d4648e01e13bc42500c438f71b0ca6d8505cb
font_01_sfnt_off0000ec80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC80 17480 bytes
SHA-256: e28fd926930f936f7b3dec704ff7e7a959b923b355dae64ae91a5bf0be8724fd
font_02_sfnt_off00011a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1