Malicious PDF — malware analysis report

Static analysis result for SHA-256 50c683df163b8a74…

MALICIOUS

PDF

82.5 KB Created: 2021-09-21 12:06:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4239d2226d32e07a928fb8bedbe46e4c SHA-1: 6ec50f71d2003799200d7be47205d955c56ddcb2 SHA-256: 50c683df163b8a7484a160ae75cc70a169d7e6c53efa0624b6beff5341261042
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or credential harvesting by redirecting users to malicious sites. The embedded JavaScript is likely used to facilitate the redirection or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://0575zl.com/userfiles/file/rodopumosawiref.pdf In PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/sevufipokenanofawiza.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/zubizuvopixuxadaz.pdfIn PDF document text
    • http://greenbelt.abwingsmd.com/uploads/files/73764369254.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/bobumusevosazenoza.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/254e84b4b4fcd0e0b672192b04f3baee/gokiputudetitarumarog.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/bapidogap.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/risida.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/99266480449.pdfIn PDF document text
    • http://dautuck.com/uploads/userfiles/file/sajizekidexuguboju.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/serusepoz.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/sixetuvemiziwakikunut.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/161331d24f018e---nasobajegozazagebiwexi.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/10580203023.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/30484080873.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/vomafukifub.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/dokovagufipigewawuga.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/95740184756.pdfIn PDF document text
    • https://kvizek.hu/ckfinder/userfiles/files/kutewa.pdfIn PDF document text
    • https://gameadvisers.com/js/new/fckeditor/userfiles/file/tufigarulikexegi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=will+an+iphone+sim+card+work+in+an+androidPDF link annotation
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/65324789006.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_off0000dcce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCE 10852 bytes
SHA-256: 3bcb87957d3644e54745fba2b9f9d0c83b47c86a4fc96d683452d526f5cb4e87
font_01_sfnt_off0000f5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AA 18060 bytes
SHA-256: f4a8b003805749fb1c0fb8dc104a553f21f6fa42809c8486eadc3de095eef826
font_02_sfnt_off000124ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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