Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0c5d2dc98579960…

MALICIOUS

PDF

84.4 KB Created: 2021-09-12 12:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 09905a0e669d0c039e8cad5aac1fdc3d SHA-1: 5b2a3480609b8d994f665301bb262931cb7695fd SHA-256: f0c5d2dc98579960e7be6f944717430ef0db3343e9099a0b05c4ef95dd4ad9d4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and a high number of external URIs, many pointing to disposable domains, strongly indicates a malicious intent, likely phishing or redirection. The ML classifier and ClamAV detection further support this assessment. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://mariancozma.com/_user/file/18817544734.pdf In PDF document text
    • https://panoramamall.bg/ckeditor/ckfinder/userfiles/files/83039049930.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/41405057993.pdfIn PDF document text
    • https://euforbiabulgaria.gbinvest.net/uploads/pages/files/48471395188.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/30244462452.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/97139127943.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/gazilajabixevipason.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/95578867255.pdfIn PDF document text
    • http://tuyothuyluc.vn/webroot/img/files/nugipelapeked.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/nunelitaf.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135ca73208d7---rimofonusinapesuzipavun.pdfIn PDF document text
    • https://villadelauca.com/userfiles/file/63314421034.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/ninegokawemejugur.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/376840945613964fff40d4.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/sutavuv.pdfIn PDF document text
    • http://exima.kr/userData/board/file/32196495737.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/58475726297.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/56053702200.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/47160474530.pdfIn PDF document text
    • http://hwangtosidae.com/userData/ebizro_board/file/vupazepig.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/wovipunaliwedemowapibepib.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/kigubisigeder.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/dc6c04e37b09d17af7c7cc7457877c34/83770619560.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/sowijixa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=create+symlink+androidPDF link annotation
    • https://mediacentre.aerlingus.com/js/ckfinder/userfiles/files/23363340751.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_off0000e263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE263 10648 bytes
SHA-256: e2dcb7c2f42b843b49861ea2314aa4af8cee05bad7cad33097c567351418a019
font_01_sfnt_off0000fac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC0 18628 bytes
SHA-256: 2a582ccef10256c3eca752be6575447d27db3be1281d5439a506964364380fd6
font_02_sfnt_off00012b99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1