Malicious PDF — malware analysis report

Static analysis result for SHA-256 e845a516cb1905af…

MALICIOUS

PDF

82.5 KB Created: 2021-09-10 20:52:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 97f55ce002e715993638fc72885cc8ce SHA-1: 59bcf1a0cef68e570d70f5b85a273c3934b15bd1 SHA-256: e845a516cb1905af97f98d687f5bd35f7b1ed7acd020f6c6cdb8017778e7f93c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to domains that appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of multiple unknown URLs strongly suggest a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://panda-es.tokyo/yamituki-n/uploads/files/kunenototokubatiseged.pdf In PDF document text
    • https://kampusogrenciyurdu.com/file/95997191811.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/retukirofarojizinugudaj.pdfIn PDF document text
    • http://sinners-party.de/media/file/89216738151.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/tajekasivokasun.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/tavivigebakevexu.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/difopilididupikagefutima.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/xutesifafotaduxezugur.pdfIn PDF document text
    • http://393citizen.com/upload/files/82553241495.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/70221889833.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/58810097866.pdfIn PDF document text
    • http://halongwave.com/userfiles/file/bariganujerasop.pdfIn PDF document text
    • http://om-ar.com/userfiles/file/45260686841.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a5bca7923---27065450959.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/20083385725.pdfIn PDF document text
    • https://noithathoaphat11.com/upload/files/latelidulovugatikam.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/fovulilexub.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/mapubuvijepexiwemogolo.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/31597557978.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/78990704768.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/nufafusivu.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/64505157676.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/metatamiz.pdfIn PDF document text
    • https://siroyensao.com/upload/files/bisolifavuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=gta+5+download+for+android+no+human+verificationPDF 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_off0000db98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AF 11000 bytes
SHA-256: e83903c5326b7bd14b811f6b648c2ee05640680405d8a8d0e4dbca5bf6b3bdf3
font_02_sfnt_off00010d28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D28 17940 bytes
SHA-256: c99eac179cc215b0c2d6a61d1e6a3bd034433ec003c7a160289e2c8cefb7cb00