Malicious PDF — malware analysis report

Static analysis result for SHA-256 add28b157de79691…

MALICIOUS

PDF

80.0 KB Created: 2021-09-11 15:08:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: a0d9cc02dda7dfa9ae82b26d6ed18696 SHA-1: 63f09852b0fac38c415315f4c2d2d61c635e27fa SHA-256: add28b157de79691627567d895bf8694d84f93ca5360416af25c26d9b07eb506
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The PDF also includes numerous external URIs, many of which point to suspicious domains, suggesting a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/xovadinexazijagopetituxe.pdf In PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/rakagidatubotexoditodu.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/gizusulesetozopubegenope.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/37324923496.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/3260897310.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/149266917.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/67414197897.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/44130389970.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/pebisonezoxidiwebizo.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/kinoladovodin.pdfIn PDF document text
    • http://vncanada.vn/uploads/files/vonukujivu.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/xiwaponeboxi.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/dajasufetiw.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/58795472162.pdfIn PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/xizubexov.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/92593968179.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/2444311514.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/jukupexujirixaduku.pdfIn PDF document text
    • http://imaginove.eu/data/Files/wuginegexatukanir.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/gatow.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/a8690628e27b3c01b7c2007b71ecbc0d/54903816547.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=next+launcher+full+versionPDF 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_off0000d49d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49D 17344 bytes
SHA-256: b1258770eb729a148b4e1114097293be6f42a85f8927d438b70ac2007db6c9f2
font_01_sfnt_off000101db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DB 10680 bytes
SHA-256: 85ed1840161ddc4ba836a8da6c12daf82e1867f7b71905736eacf1c7e6ad58a1
font_02_sfnt_off00011a57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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