Malicious PDF — malware analysis report

Static analysis result for SHA-256 96cedfcf8e26f1ee…

MALICIOUS

PDF

89.4 KB Created: 2021-09-18 17:57:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bb470c4be0223d4a07d0fcea31b88f2c SHA-1: 92e6e661eab7342a08b4a1968c1cfe4d18e35a5d SHA-256: 96cedfcf8e26f1ee6bf9b4901624d685f57dad39cf8802d061a2ed828b5d89fa
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to potentially malicious or disposable domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, and ClamAV detection confirms this is a known phishing/trojan variant. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://thucphamtruongxanh.com/Upload/files/54153612360.pdf In PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/ce3c28e6fe1ec090d744ecf00504713e/55388008575.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/delomelesuj.pdfIn PDF document text
    • http://lukinserv.hu/file/64126907341.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/wuzanajeropomusugejijafav.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/melomometiru.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/wetuvosajenonovi.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613caa6e2c4f7---36135637232.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/laralipabewapegumivil.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/88377527621.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/29027604592.pdfIn PDF document text
    • https://online-wums.com/files/files/loraletubogukoke.pdfIn PDF document text
    • https://network-italia.it/file/pimexifanujolaxabuvov.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/dudizerokirekamumuvoz.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/51446678465.pdfIn PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/99423873067.pdfIn PDF document text
    • http://crediramasrl.it/public/file/5284790486.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/latepalejinabefumib.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210906001907.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/22268487003.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/78828625823.pdfIn PDF document text
    • http://tamphuhiep.com/Images_upload/files/pisinanawogozuwopeb.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/98698959999.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/fukibofewixi.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/31345874016.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=pokemon+sun+downloadPDF 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_off0000f86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86C 18484 bytes
SHA-256: f9f3ba351943b5d1e9cc507a97e4c9cc71bd83d6f439ffbedb2b8f660a43c450
font_01_sfnt_off00012813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12813 10400 bytes
SHA-256: f2ee7a3ac9189feddcd46f17346e626c7147c938b98d21112bbd938bb7fae919
font_02_sfnt_off00013fb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1