Malicious PDF — malware analysis report

Static analysis result for SHA-256 21345aa665fde969…

MALICIOUS

PDF

78.3 KB Created: 2021-09-09 00:11:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 194ba2831c98ea7b12128c767dd5cf86 SHA-1: 85ad025fec2adf551b1535070b373853d00e071e SHA-256: 21345aa665fde969ac139911f52ecd438a59b2cf04024d1752fff465d42b9e79
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious actions within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous external URLs suggest a phishing or spam campaign aiming to drive traffic to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://nomylo.ru/uplcv?utm_term=4k+video+downloader PDF link annotation
    • http://marsalanoleggio.it/userfiles/files/36710464685.pdfIn PDF document text
    • http://secoinblock.com/upload/files/37484526859.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/33806755370.pdfIn PDF document text
    • http://nemalipics.com/93130043768.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/jufirudujumuragaker.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed30bb108c---74826593961.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/67765121258.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/mexufixedijupirasafojo.pdfIn PDF document text
    • https://twinscooking.nl/twins/userfiles/file/nikibebobete.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/63809080007.pdfIn PDF document text
    • http://hennel.hu/sources/elemek/file/fuzerisobub.pdfIn PDF document text
    • https://valgott.com/images/userfiles/file/76152933479.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/20492697160.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/salezosavani.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/vedubusoxiwexubo.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16136b46539f29---6453248235.pdfIn PDF document text
    • https://letajicikoberce.cz/userfiles/file/21979911733.pdfIn PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/gefezaxuxoferenakirux.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/wekol.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/basej.pdfIn PDF document text
    • http://apicn.net/upload/files/gutugenugel.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/nimil.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_off0000d062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD062 17304 bytes
SHA-256: ec44d103c71acebb4072e15bc4a9b95bfd1baabca811fc6e6e3daddf5067ca6a
font_01_sfnt_off0000fd29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD29 10200 bytes
SHA-256: a6354c860644bcbf2ab2a70da8329ec523b5a4aa58f0504c5f46e83cb63bd067
font_02_sfnt_off00011428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11428 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.