Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b7b175f7ca497bc…

MALICIOUS

PDF

90.6 KB Created: 2021-09-09 16:37:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 32bd6578e7a7524af8ba447c8bf32939 SHA-1: 79c2088d4b4efe5d0158b1cd7abf12b025af841e SHA-256: 3b7b175f7ca497bc94063550114d66c120703d757507e38a1977a70f2062fab9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://medvor.ru/uplcv?utm_term=komodo+8+android PDF link annotation
    • http://artstudiodesign.it/userfiles/files/rowowukekuresaj.pdfIn PDF document text
    • http://dworbieland.pl/userfiles/file/jugozutevom.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/foxepedapijezuwakugeni.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/tozosazogodirox.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/9274709383.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/78809281947.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/75538724156.pdfIn PDF document text
    • https://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/60783733864.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/damuzejofevirovixewozajus.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/wowabamizajifobefoluje.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/vixamuko.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/12632624123.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/muwabavesor.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/xujuxenilepojilofew.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/juwogekejuwexige.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/30141725766.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/27358231608.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/pejazifuguvosinemakuwopem.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/durebuxebakowopijazijove.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/27735654891.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139fc1b61f17---minawudated.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/1027djk6b0u483drilf7lp9omv/2726163113.pdfIn PDF document text
    • http://xecuoihuyhoang.com/uploads/userfiles/file/9667251759.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_off0000f957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF957 10164 bytes
SHA-256: fb542859e3118f5f3f9b6276b91a6186ca61891790e6bdad7661919ea503ce17
font_01_sfnt_off00010ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF2 20560 bytes
SHA-256: c4439bbd56dc42a15a06f58cd0b9d1f0701875b3ec02503d1c769a448b5d6a22
font_02_sfnt_off00014500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14500 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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