Malicious PDF — malware analysis report

Static analysis result for SHA-256 08cfb744163b531c…

MALICIOUS

PDF

84.4 KB Created: 2021-09-13 14:30:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b67f2d4e91f5c7bd61db3bd1ba469d0d SHA-1: b38cd8daece6e4a27366ae2e2483aa475eaf8c7b SHA-256: 08cfb744163b531cd2e752a42d380dc9144cf2372dd2dd4293698dcc4da4045b
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous embedded URLs, with many pointing to potentially disposable hosting, consistent with a link farm used for phishing or malware distribution. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically indicates a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://ed-web.cz/userfilesfile/30992016471.pdf In PDF document text
    • http://grafichesirio.com/userfiles/files/xulowipejutezopakowafosal.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/sitofe.pdfIn PDF document text
    • https://gdaniec.com/upload/files/74699485973.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/427e0d63a8c7a563a78a3508591b863c/12005615717.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/meziresazipufimotevelis.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/33240098252.pdfIn PDF document text
    • http://xn--80aaaaadfwa5aftjhxrkcrg8iwc.xn--p1ai/pict/file/xojapogubiwabamuta.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f341292601---soxuxugebe.pdfIn PDF document text
    • http://om-ar.com/userfiles/file/soroboxumudijafobofos.pdfIn PDF document text
    • http://kirche-treuen.de/UserFiles/File/vizetupofiso.pdfIn PDF document text
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/tolatonawarufigof.pdfIn PDF document text
    • http://vntattoosupply.net/uploads/image/files/jixesimem.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/nilikewamorelimamiris.pdfIn PDF document text
    • https://cet.sk/res/file/kukuwa.pdfIn PDF document text
    • http://maimungkorn.com/UserFiles/file/fefino.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/wipudi.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/57e01be5a6979bc685d1abaf9b53db44.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/bexowo.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/55394027783.pdfIn PDF document text
    • https://successalpha.team/upload/files/gosinixasaliferirit.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/fakazeto.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/negarup.pdfIn PDF document text
    • http://mathrainbow.com/userfiles/file/sewaw.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/22949737069.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+send+a+photo+from+your+phone+to+your+laptopPDF 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_off0000e556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE556 10960 bytes
SHA-256: 5560e75aa2bc2151c83e0a7714404f44b47884b705454025d9c6c7948db4d270
font_01_sfnt_off0000fea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B3 17668 bytes
SHA-256: fb08ccdbd921e6fe3ae350a4dfe81f5c57e04563c91560681f75ec727c823f68