Malicious PDF — malware analysis report

Static analysis result for SHA-256 560f8365a1e4f791…

MALICIOUS

PDF

79.4 KB Created: 2021-10-14 06:14:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c5927484166d91a14a8dccc6d5d26802 SHA-1: f5e00d52d1ff49322d36b9f85163070d958412ff SHA-256: 560f8365a1e4f791ecb5cec0b01856605d7503ae29a177ca80918687d1d9fac6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious sites. The authoring application 'wkhtmltopdf' suggests it may have been generated programmatically to obscure its true intent, likely to lure users to phishing or malware download pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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.
  • 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://rabudiagnostic.com/userfiles/files/97239192269.pdf In PDF document text
    • http://thebookmarkcafe.com/uploads/files/39658019965.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/gojenuj.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/bosixuse.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/somujajuxisusavevubizem.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/96370793117.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/68958713582.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/jugezanasukodeboxasibeziv.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/55931484060.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/watabinatinovemudu.pdfIn PDF document text
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/63622922866.pdfIn PDF document text
    • http://mtegl.wsystem.sk/userfiles/files/kawolipizebupupek.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16146b943bb079---rebakeduxad.pdfIn PDF document text
    • https://verner.lt/images/files/20210536657.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/wusugeposuwodajo.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/35689089147.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/96437719585.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/53822423707.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/budewusujevonupojibo.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/d41c08aca2b5a4c50d22e6d4b6e3ab2a/nenolofomu.pdfIn PDF document text
    • http://neodermclinic.com/file_media/file_image/file/7597616074.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/91478182141.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/80570147445.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/fukexadujexer.pdfIn PDF document text
    • https://architektor.ru/uploads/file/kezibedasukaropogiwigu.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/RC0zOYPQW8A/uplcv?utm_term=absolute+value+equation+examplePDF 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_off0000d089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD089 17952 bytes
SHA-256: 30c991f2819237b975e04b230bc723b3e119b0ad25a76a69032df88fb3829b97
font_01_sfnt_off0000feb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CE 10848 bytes
SHA-256: 494004851b9f0a90d2fb369341a1cf8e647ff479ab8dabfba21ed0990d499fd7