Malicious PDF — malware analysis report

Static analysis result for SHA-256 983b04ab2199ada9…

MALICIOUS

PDF

75.4 KB Created: 2021-09-10 04:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f6aafa372d18385fc4254f52f5d5ff2f SHA-1: 037eac9576aba6d3e621e2b7be3e4d7e7c78753a SHA-256: 983b04ab2199ada9708f0c43c0f8e4b69b3aa5b1ba3c6ac592e0ff0813eb2c59
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 potentially disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of embedded JavaScript suggests an attempt to exploit vulnerabilities or execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.chp.pl/ckfinder/userfiles/files/kadis.pdf In PDF document text
    • http://fioredda.com/userfiles/files/vidosinapadum.pdfIn PDF document text
    • http://marketingnews.fr/images/file/41625857862.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/wufagemudus.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/topized.pdfIn PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/20217065097.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/51437228504.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/pisafi.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613024fe98e59---tavebizupelozedu.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/bb79d21b1858aaaad9865d12171c95ed/60063879539.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/85633375624.pdfIn PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/42627595043.pdfIn PDF document text
    • https://mytopics.it/uploads/file/lesum.pdfIn PDF document text
    • http://celesteandtorsten.wedding/images/file/1828266186.pdfIn PDF document text
    • http://hkacca.com/userfiles/dasat.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/29641056059.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/nudesojisilalutu.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/9607223817.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/lunutanifiwiw.pdfIn PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/ziwofupozujejodozowu.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/80250690219.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/29958091716.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/29079333762.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/wezovuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=zombie+defense+hackPDF 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_off0000c2dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2DD 10692 bytes
SHA-256: 50ba2282fde48e87e1baf255bd8a6eab9347b1a10af27b4e10e13bd76b42d4b6
font_01_sfnt_off0000db31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB31 17392 bytes
SHA-256: 9e6c12a9a02095aab9b8d1aa6e4607d769e804709f9893636d6e2dd3f6039338
font_02_sfnt_off00010814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10814 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1