Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bade9e036977794…

MALICIOUS

PDF

57.3 KB Created: 2021-09-17 02:10:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cc0829d6be6b01be5ef7a998f6cb8e46 SHA-1: ba2d008e4b97ed76adc090b4d6c8478cb81c7877 SHA-256: 4bade9e036977794c1e27a5285ea452a7b9ee7730829a8889243968296e4e16d
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. The embedded JavaScript likely facilitates the redirection to these external links, which form a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7008

Heuristics 5

  • 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
  • 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://infrive.ru/uplcv?utm_term=tutorial+membuat+video+alight+motion PDF link annotation
    • https://ximangcampha.vn/upload/files/10225955526.pdfIn PDF document text
    • https://techinnsrl.com/writable/public/userfiles/file/48300607609.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-9/file/wixeba.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/gojuxojirutew.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/98614732783.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/zonitavokekelifopupefuno.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/32257146739.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/3cdd2f5785ed697e037e2c1da1a5197d/bigaramogolezifofirakufad.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/0f09e925aac4dc71a4cc821ee8f8cbe5/48256561988.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/26629303170.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/81066014509.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/2737756739.pdfIn PDF document text
    • http://sbkf.org/files/files/fefur.pdfIn PDF document text
    • http://www.oomewatersport.nl/upload/files/55935104173.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/rutosa.pdfIn PDF document text
    • https://nhomphuongnam.com/upload/files/xapefukesatezexaj.pdfIn PDF document text
    • https://nistd.in/userfiles/file/81234725727.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/jozamifufawaj.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210910104337.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/25131258070.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/45093987018.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/repofitudovosabug.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/99147985750.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/forotoxasavog.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEC3 10796 bytes
SHA-256: 896a62c5949e34d08ef3cf17af50bd89166cac60f5283e1db226ae123a9c2fb5

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