Malicious PDF — malware analysis report

Static analysis result for SHA-256 823e72a919f6fd90…

MALICIOUS

PDF

73.6 KB Created: 2021-09-19 06:30:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0e26dcd5c466de2e4bc00092fbd108cb SHA-1: e3be82c597235fa482764b1a9992ca741f5d112d SHA-256: 823e72a919f6fd90ed66b7167ef338165bf3614170f595b953026b28bc0489ee
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the high number of external URIs indicate a malicious intent to redirect users to potentially harmful content. The ML classifier and ClamAV detection strongly support this assessment, suggesting the document is designed for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://queure.ru/uplcv?utm_term=cloud+gaming+hack+apk PDF link annotation
    • http://abwclayton.com/uploads/files/63631251214.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/62873143959.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/70817122180.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/961137128.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/255c598d23e47730fba9e6b0ccfb28e8/47239127541.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/zudibekasuliworuwolopubo.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/61338477442.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/99408752492.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/zonoposeb.pdfIn PDF document text
    • http://web5gstore.com/Files/files/dajelep.pdfIn PDF document text
    • http://baby-daycare.com/uploads/files/202109131330522965.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/36999298457.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/suzalozozenifopijiwunu.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/xekesigej.pdfIn PDF document text
    • https://digireg.cz/upload/busamudokomonu.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/tewediwanufozaziriz.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/zumazulotigezu.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa8b6b3bff---58358549589.pdfIn PDF document text
    • http://hmed.vn/upload/files/79785309308.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/zowux.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/79209681301.pdfIn PDF document text
    • http://amdind.com/userfiles/file/79385407804.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/26316135355.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/21500616507.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-4/20210904120057356829.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_off0000c016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC016 10688 bytes
SHA-256: 47b3a8f740b84c64d9c3f2b9844bfe6c1f5f24e4909d7d274bce2ab3e9495b63
font_01_sfnt_off0000d81b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02D 15908 bytes
SHA-256: 79ef7eaf50f8d74f4bc59976aced39abff3bd9dd6f8b1b12ecdb96f69df944f9

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