Malicious PDF — malware analysis report

Static analysis result for SHA-256 760f4890b77a1d3b…

MALICIOUS

PDF

71.5 KB Created: 2021-09-13 22:19:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1bcb23f5e40d621f771b8e92c16f2e99 SHA-1: dbd24d8a52c86cc5b27432b6309e6e63d32a8e68 SHA-256: 760f4890b77a1d3b2caa8baebcb7756385a2660b83f443b1ee700f9172f5b059
124 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with a specific heuristic identifying it as a 'link farm on disposable hosting'. The presence of external URIs like 'https://chcial.ru/uplcv?utm_term=bar+chart+with+two+variables' suggests an attempt to redirect users to potentially harmful content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5354

Heuristics 4

  • 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.
  • 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 https://chcial.ru/uplcv?utm_term=bar+chart+with+two+variables PDF link annotation
    • http://sydjpg.com/images/upload/file/20210914_002705_156.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/dikawako.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/87361843447.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/59947394389.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/vujox.pdfIn PDF document text
    • http://tvsatkrosno.pl/userfiles/file/89261316162.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/timekimuzidojegumopolipor.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/xatejumaromipe.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/vagubakifitonuxitide.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/ferolasor.pdfIn PDF document text
    • http://ychnjl.net/userfiles/files/liwinalufubegexob.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/womoref.pdfIn PDF document text
    • http://sgrdinstitutionspandher.org/sgrd/userfiles/file/74942503708.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/96757910652.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/78204511377.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/pewezezupatowo.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/kujeduzolojalavujugod.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/jexupilonixa.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/358a668fb4613355a8dbc63001bc3fd5/sewojetejalibatevamoni.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/wanavajofupuzemexabizevef.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/sixatojuko.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/nepegeneviju.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/32145852057.pdfIn 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_off0000c5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFB 10568 bytes
SHA-256: f2637537e477a68b976113fd3ebf1451ee7f30ea4e6c92c26eb9a7072c31640b
font_02_sfnt_off0000f65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65B 17760 bytes
SHA-256: c0fd3e9838b24920646accbd87e7ac318ad8bdd0568286b78b5ced1baa62a8d8