Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9c95938864b2ef4…

MALICIOUS

PDF

81.4 KB Created: 2021-09-16 00:06:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9ba66e08d11a95cecb4500fc5f3c3b89 SHA-1: bf1ac9e5d9b3c44ee2935128ae67309563a7c5c0 SHA-256: c9c95938864b2ef49e51e7c30faecc4481cde33efd2b952d88e6d898b099b8eb
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The file was detected as malicious by ClamAV and an ML classifier, and heuristics indicate it is a link farm designed to lure users into downloading files. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests a social-engineering attempt to trick the user into installing malicious software or providing credentials. No scripts were extracted, but the PDF structure and embedded URLs point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://dalycity.com/wysiwygfiles/file/xukew.pdf In PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/40996306314.pdfIn PDF document text
    • http://nemochem.cn/upload/files/zimubo.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec3a1539a5---70675808401.pdfIn PDF document text
    • http://maksimetall.ru/files/24212025005.pdfIn PDF document text
    • https://plasy.com/uploads/file/fabizulafoburepo.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/21904815847.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210915210244.pdfIn PDF document text
    • https://viceda.com/userfiles/file/72023262925.pdfIn PDF document text
    • http://k9careclinic.in/ckeditor/ckfinder/userfiles/files/zopov.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/35333428323.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/ruwatijiwotelagoxag.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/70136928056.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/77324272983.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210905_BCE6B7121F862051.pdfIn PDF document text
    • https://csn-alliance.com/data/files/kiginikegazovudaxesepagof.pdfIn PDF document text
    • http://eko-baby.ru/userfiles/file/96870930153.pdfIn PDF document text
    • http://beiwendq.com/data/attachment/file/41503733288.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/84262334288.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/vonapubozoxexigegoj.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/dusoxepaveliji.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/duvemisalo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=transfer+images+from+android+to+iphonePDF 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_off0000d848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD848 17912 bytes
SHA-256: aff3445c3600e68c6cbc17574d27faf8c9e8e9f844e905e8f534cff86676e9bb
font_01_sfnt_off000106eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F02 10860 bytes
SHA-256: d544016f820bb32623a0bd55f065b76dd4592cbb826e416667b6569e4c819c03

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