Malicious PDF — malware analysis report

Static analysis result for SHA-256 204327128cccf302…

MALICIOUS

PDF

85.8 KB Created: 2021-09-16 02:26:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f8a0a3ee10065cc90a824ad9ff02851a SHA-1: a23b362fa1e7658cfe043efd78a5256b8a564bd9 SHA-256: 204327128cccf302191c5acc3a1b4e48ebb88a0ebfbef4f7992dbfc58defe0a3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, which is characteristic of a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest potential for exploitation or redirection, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 http://sipsak.nl/userfiles/file/67863761701.pdf In PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbefc6c578---83473071016.pdfIn PDF document text
    • https://yogaspotny.com/userfiles/file/jonazetisetusatifos.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/kugolulijenoxanopujafisuf.pdfIn PDF document text
    • http://bippex.com/filespath/files/20210913174504.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/rasizezifuletasitifanabi.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/eq2h0g5tfbnmfhn9ok73tp1l75/47004203408.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/romawikalotedux.pdfIn PDF document text
    • http://showdoimovel.com/files/files/48077686775.pdfIn PDF document text
    • https://newdesert.pl/userfiles/file/moferofoxutudubam.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/suzetipojavunupugikarami.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021091213214473499.pdfIn PDF document text
    • https://aitalk.vn/upload/files/32160626401.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/kelogudipedetufutapu.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/nogasaxamemuditon.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/60092494594.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/boluvigokuvojomajalezow.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/33878642482.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/48945785119.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/75863313047.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/tokabik.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/33795194605.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/bodinefule.pdfIn PDF document text
    • http://sushibelovo.ru/files/gatevi.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/romerofegeborapufadinogu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=tom+and+jerry+in+the+big+city+hbo+maxPDF 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_off0000e680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE680 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE97 11052 bytes
SHA-256: 6bed8b636b7c363c12dc20dba562707c09a536845732f6de5ddc20ad242dee99
font_02_sfnt_off000117e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E6 19060 bytes
SHA-256: 84ebe24833efcb41f586036bc37dde85015646379ca8c3beeb0e75b791462f3c