Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd5800675ca0e748…

MALICIOUS

PDF

73.4 KB Created: 2021-09-27 06:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ebb64562ffe830998aa5f2f18e0ffe44 SHA-1: edcfdcafefb6a530595317804fe962d075703d13 SHA-256: cd5800675ca0e748013ca406dcf5d75fa95b79e2c78b3ec26dae966060f71359
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to disposable domains, and is identified as a link farm. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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.
  • 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://www.comperat-89.fr/ckfinder/userfiles/files/59060707787.pdf In PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/fc8312b1c7913667201e3179a448aa8c/bifapisigegevoxod.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/pixop.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/66486041187.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/dutis.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/zezegovivumam.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/82362443727.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/befak.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/83684630181.pdfIn PDF document text
    • http://www.520amis.com/upload/files/88106943437.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/73253874458.pdfIn PDF document text
    • http://fthyhs.com/resource/docContentImg/file/2021-09-15/887c785c9dfefa3756640df6f5a8d788.pdfIn PDF document text
    • http://rancholasmonturaspremios.com/campannas/file/82582984986.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/zibutusegavatepidexememe.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210913221138858.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/wamovuxukorubawujodu.pdfIn PDF document text
    • http://putzlappenborner.at/editor_up/wofaxajupokidodiwuvadabom.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/sosazinujugunot.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/72652200477.pdfIn PDF document text
    • http://olivetheater.com/userData/board/file/23621143733.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/wivikedebuderaleri.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/48986420752.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/71820157715.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614eb3bf08ad0---26345247674.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/torividiwenidifivugawenuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=que+es+la+neurolinguistica+pdfPDF 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_off0000bbba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CC 16712 bytes
SHA-256: d254b9e7e2092adaa9a5b5d87ed0396178969a572b5f98d72c4e16ad489b3dd3
font_02_sfnt_off0000fe74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE74 10956 bytes
SHA-256: 375869af4fcd4821dcf1d73322d5aef997c97daf51ebe5aa0652ebe2b06ed341