Malicious PDF — malware analysis report

Static analysis result for SHA-256 966145e621f0c60d…

MALICIOUS

PDF

78.5 KB Created: 2021-09-18 23:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b5c0b1212ffb6743bf6c23283cdd198f SHA-1: bf7e668f364f7fe85dac513ed1d50d42d8dcac11 SHA-256: 966145e621f0c60d90d662f4e457fdaf400cfd22d8beb5c8303f2a5535dde405
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script likely redirects the user to a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous unknown URLs. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145a1a3b8e7c---vumurosalepozedebejapiv.pdf In PDF document text
    • http://coaching-scolaire.net/userfiles/file/95558641626.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/90464803211.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/30491671926.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/gepofumaz.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/vavegewukupubefu.pdfIn PDF document text
    • http://srub-servis.ru/userfiles/file/50644187663.pdfIn PDF document text
    • https://limsurempat.com/contents/files/82217395407.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210909111245_9v6sb3.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/17008312169.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/vuwasapivojomasanolebal.pdfIn PDF document text
    • https://codefon.hu/js/ckfinder/userfiles/files/xizogezokirevetagomitumad.pdfIn PDF document text
    • https://olterus.org/contents/files/nibutuzujulivusiwifanamer.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/18887957839.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/tovajijalofi.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/kavumunulupunifos.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/sunilavodadarusof.pdfIn PDF document text
    • http://ccsilver.kr/files/fckeditor/file/1313442055613d42f28cf1a.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/54183968483.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/dukigepuvanofa.pdfIn PDF document text
    • http://plechotice.sk/tmp/file/fuzezimagubifubolupon.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/6a33158b79b6172e719d93ac817e986f/59606169874.pdfIn PDF document text
    • https://melnikhouse.com/userfiles/file/vedolezolakexegama.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/91962342896.pdfIn PDF document text
    • http://mingzhicc.com/userfiles/files/15438493284.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/27584926407.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=helicopter+and+tank+gamePDF link annotation
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/76993873463.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_off0000cf43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF43 17164 bytes
SHA-256: d9d67ec0941aff4f90c1fee56123a59cf259d63825d1ef543f1f7c57e5e1a9fa
font_01_sfnt_off0000fb92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB92 10772 bytes
SHA-256: 7b502ca06f33660eb5d0c20ea4bebe3e8dd55dad3f1b1372782123547eb1cfcb
font_02_sfnt_off00011412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11412 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1