Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c3b7a524e637b5f…

MALICIOUS

PDF

82.7 KB Created: 2021-09-17 21:14:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 50ffe91bede0a4d5887254d3e2350305 SHA-1: 739efdbb04e1313c3c35bbecbece8476684f5cf8 SHA-256: 6c3b7a524e637b5f2a6ee50e400facd55437e0a09ab909b787df06835f89aca5
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 disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

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
  • 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 https://nyirfa.hu/uploads/files/5333921291.pdf In PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/95753421765.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/26115555043.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/pokelowubulunewugelusimin.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/pulewikenegovixumedisesof.pdfIn PDF document text
    • https://mayxaydunghoangphuc.com/userfiles/files/26377789834.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/vujapaxonevemejoz.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/sebusesedaw.pdfIn PDF document text
    • http://trieuduong.com/images/Download/66067613367.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3d4c8368e---75638739745.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/vinisegabogorabibepo.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/jukalamer.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/78586274875.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021090501490971.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/dujoravimizi.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/23592975086.pdfIn PDF document text
    • https://computerzone.pk/file/woxunakodoveribij.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5a90dbbb9---detopa.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/vitip.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/23641748960.pdfIn PDF document text
    • https://krossi.ru/images/content/files/gevonogexagan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=tubemate+best+youtube+downloader+for+androidPDF link annotation
    • https://grupo.iberia.com/js/ckfinder/userfiles/files/noronagojezasob.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_off0000e022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE022 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF839 10916 bytes
SHA-256: 3e7aade2f6b303557f38c90fe7cca73d986846c463d43565c8d3ee734b0ae870
font_02_sfnt_off0001118d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1118D 16812 bytes
SHA-256: 1d36fff6e8d685b9abc7e2592a9c34120dcc775b9cd709324585914345b31c40

Open this report in the interactive analyzer, or submit your own file for analysis.