Malicious PDF — malware analysis report

Static analysis result for SHA-256 f10fc14d0fd913c4…

MALICIOUS

PDF

88.8 KB Created: 2021-09-17 11:53:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 61bcb59d6e6db85f1b114097a5863910 SHA-1: 816cd7aaaa69c36b92f58539ff859439cc32704a SHA-256: f10fc14d0fd913c4ae0fc29544678346e9911edd05c20216f9cf049255f1d63f
126 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, indicating malicious intent. It contains numerous embedded URLs, many of which are part of link farms on disposable hosting, suggesting a phishing or spam campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to redirect users to various external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 5

  • 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
  • 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://chcial.ru/uplcv?utm_term=sultan+movie+full+watch PDF link annotation
    • http://geometramaurotozzi.it/userfiles/files/97583120382.pdfIn PDF document text
    • http://ychnjl.net/userfiles/files/lunulut.pdfIn PDF document text
    • https://fond.ru/userfiles/file/53938385919.pdfIn PDF document text
    • http://tuzoltosagmihald.hu/userfiles/file/84008635081.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/6150932486.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/penazutijusenoxoje.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109131410071276.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/98876990792.pdfIn PDF document text
    • http://xahuaheng.cn/userfiles/file/siguzulebe.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/tikiwamerasi.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/pozeruwofe.pdfIn PDF document text
    • https://botroul.be/uploads/nizurukigejekapedebadilo.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/45499347802.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/19027511047.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/70384051862.pdfIn PDF document text
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/99471546199.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/losokufew.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/55372558531.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/9998303612.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/43590039559.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161351f79c7874---tatoxagefaxum.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/88818314395.pdfIn PDF document text
    • https://discovery99.com/userfiles/file/wovaduravewes.pdfIn PDF document text
    • http://benly-carson.com/product/files/95093510222.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/fufuxopebowolasufokoxem.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f56c08006c---98640880216.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_off0000f87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11095 10660 bytes
SHA-256: f684cb918fdb4cf8a27400393b8bdf4f022c192862f830f0a6f6591eac334384
font_02_sfnt_off000128e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E0 17520 bytes
SHA-256: 102e6c9e0d1c53926cb812c4eb28d5f204aae812f349255d87a79e0ce09627b5