Malicious PDF — malware analysis report

Static analysis result for SHA-256 67003c18a8895c4f…

MALICIOUS

PDF

88.5 KB Created: 2021-10-07 00:59:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d0c46c73156e2969ab93998722ea8e86 SHA-1: 50577254f84cecc2f990f463ac91d788afca6aa8 SHA-256: 67003c18a8895c4f10147346b4686cd0b42132298e10f689ccb255a65f7de1af
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of external URIs and the link farm heuristic point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 5

  • 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
  • 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://inwebjor.ru/uplcv?utm_term=signals+systems+and+transforms+solution+manual
    • https://rhuyscampingcar.fr/images/files/12691138431.pdf
    • https://safe-international.com/userfiles/file/vitedefusowekufeletaluro.pdf
    • http://underbutter.cz/download/foto/visipugefajodugewijid.pdf
    • http://yizhu580.com/ckfinder/userfiles/files/92881203828.pdf
    • https://simbotour.ro/ckfinder/userfiles/files/53528058774.pdf
    • http://amirafouad.com/uploaded_files/file/85741167218.pdf
    • http://chinalabware.net/d/files/bojazavakulero.pdf
    • http://spellenindex.nl/images/uploads/95512901774.pdf
    • http://spadhotel.com/basefile/spadhotelcom/files/dijuvigubatozopezowagisev.pdf
    • http://bernendorf.ru/userfiles/file/fudetizolodefewikamulado.pdf
    • https://gujaratisamajparis.org/upload/files/vanuf.pdf
    • https://royal-art.pl/uploads/userfiles/files/35311032223.pdf
    • http://sun-green.be/ckfinder/userfiles/files/gatinemupixokimiwedinedu.pdf
    • http://honda-vo.com/upload/file/jagavubijipovoluxoxiz.pdf
    • https://solucionaesp.com/ckfinder/userfiles/files/wajidat.pdf
    • http://podolsk-kondicionery.ru/upload_picture/file/podoko.pdf
    • https://journalofcritique.com/ckdosyalari/upload/files/jigukafe.pdf
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/90171931900.pdf
    • http://magogaralbamoble.com/galeria/files/47343537952.pdf
    • http://www.vandiestbrandstoffen.be/uploads/files/goseneweligodorala.pdf
    • http://divapharma.com/uploaded/file/72117204563.pdf
    • http://kavtas.com/images_upload/files/94025264226.pdf
    • http://tourbusan.net/FileData/ckfinder/files/20210902_0813C275C2720967.pdf
    • http://itineraire-consulting.com/ckfinder/userfiles/files/13062556333.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00013c47.bin
f3fd6d03ebb4dda3d51de3b4d4d331984d5b3cfdd1f405c4163c535cce81e0bd		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13C47 16728 bytes
font_00_sfnt_off0000d3bd.bin
6f2b2d68e0794585ab0d3959eb83b4ccabcf5b8925e4481ef14556c4b93f4b5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BD 10988 bytes
font_01_sfnt_off0000ed0b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED0B 16792 bytes
font_02_sfnt_off0001051d.bin
650d43ba570142a4361b2827949f4c7842844d0757d3d7a7981fb4b5bde34b52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1051D 21876 bytes

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