Malicious PDF — malware analysis report

Static analysis result for SHA-256 90543c95e91c791d…

MALICIOUS

PDF

60.6 KB Created: 2021-09-12 21:53:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1d71ec282c90007ea42a455be6f8eef8 SHA-1: 3c6a93c85dc463ac24ab8e14f470fc67c239c761 SHA-256: 90543c95e91c791dfc21b128f0476c79c55d4bedf3e6de8df3b4ec8bad76f23b
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of embedded URLs, many pointing to disposable or unknown domains, characteristic of a link farm used to distribute malicious content or conduct phishing. The presence of 'utm_term_redirector=True' further suggests a redirection mechanism designed to obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7892

Heuristics 4

  • 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
  • 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://tribo.kz/userfiles/File/zevofadisaluw.pdf In PDF document text
    • https://nada70.org/userfiles/file/93897504210.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/pafujoxometavubonuteteve.pdfIn PDF document text
    • http://skmsm.com/userData/board/file/95210511912.pdfIn PDF document text
    • https://medtek.vn/storage/file/dukerasegawibagufu.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/83291553127.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/6903548283.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161334afa24c6d---zajoviw.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/d1npf1a5mgjmq29kulkl26vfdf/12589563917.pdfIn PDF document text
    • http://chemsdano.com/upload/files/dexavedezed.pdfIn PDF document text
    • https://pacpartner.net/images_client/imagesfile/vulezedirutoxupituxono.pdfIn PDF document text
    • https://998.geektic.com/geektic/files/34941725188.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/ledopuzesefalixolo.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/domanukewuwezaxog.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/86673613216.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/dowakefixovegelukera.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/pivikabirudixitanapumu.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/91785931486.pdfIn PDF document text
    • https://juraganmonyet.com/contents/files/73671593412.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/75346510560.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/77468328864.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=can+i+transfer+messages+from+iphone+to+androidPDF link annotation
    • 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_off0000bef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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