Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed4ebc3e6f566b65…

MALICIOUS

PDF

70.2 KB Created: 2021-10-02 11:06:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ce195a7941342a5834d42e1283b01a04 SHA-1: 54dfc148d352bcbc575519f9f386e1ef5a072cf2 SHA-256: ed4ebc3e6f566b651c64a289767ac2c116e39b9a05c8f24a3c8c29e307d7ae57
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 hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://foto-klub.dk/userfiles/file/54029371600.pdf In PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/10488211056.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/jakukujozumoxi.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/turonabidudomibaro.pdfIn PDF document text
    • https://choosetop.e-giant.net/fkupload/files/769777363.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/vomofajesepu.pdfIn PDF document text
    • https://texasbordervolunteers.org/userfiles/file/fuzesifuwureve.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/sapekodanuridojofo.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/figug.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/84016690385.pdfIn PDF document text
    • http://harlit.com/upfiles/file/gefulawimurekupawote.pdfIn PDF document text
    • http://hotechike.com/files/files/29400002209.pdfIn PDF document text
    • https://parc-hotel.info/file/21983141920.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/lijuwabo.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/36515880126.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/68801857155.pdfIn PDF document text
    • http://seamacros.com/upload/file/28721778656.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/92613672263.pdfIn PDF document text
    • http://js-space.de/userfiles/file/94368901223.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/22156061387.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/48984140868.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/8537ce563dff504a78af739258b32878/42234007539.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/97635680073.pdfIn PDF document text
    • http://ipceurope.be/assets/file/pinadupufa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=a+cinderella+story+2004+full+movie+freePDF 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_off0000ae36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE36 15772 bytes
SHA-256: 552112c323abcf0c5a800e6d2e25503ae08366dedf08c038d4f410f4a43c0a6d
font_01_sfnt_off0000d6bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BD 11220 bytes
SHA-256: 6c1e96549a6e6ccf6fce2eeede35843f830753b96ba892651d8156a7609bd371
font_02_sfnt_off0000f130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF130 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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