Malicious PDF — malware analysis report

Static analysis result for SHA-256 2476a3b12f816165…

MALICIOUS

PDF

75.3 KB Created: 2021-09-11 17:45:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: db6367692844c35495f3ec40c19d21ec SHA-1: a55a467db8e89b6919e93a1fdcc35d9e105156e9 SHA-256: 2476a3b12f8161652b9be55efb72ca07e71f25f4ba03a3b95e4f18347f748575
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs and is flagged by ML classifiers and ClamAV as malicious. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm structure, suggesting the PDF's primary purpose is to redirect users to potentially malicious external sites. While no scripts were explicitly extracted, the nature of the embedded URLs and the ML detection point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://publicbridge.pl/userfiles/file/xuvezefabuborodozawo.pdf In PDF document text
    • https://camelcarpet.org/d/files/94177492099.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/fidabopamiref.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/15331129391.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/47952446581.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/pipinidunusolasavemuxab.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/jelujatepal.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/36147096073.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/xarawajofedidodabifoxet.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/nebakusaromakirimulanuvuw.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/gudulepupenijisojafaf.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/005f3ec1c792c1ccfd2810fa2945112c/36854224978.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/birawaviwuvilukafakimesen.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/59434976193.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/lazabobat.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/piwemizedole.pdfIn PDF document text
    • http://heimundsicherheit.de/userfiles/file/79703345455.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/46722075358.pdfIn PDF document text
    • http://0851gay.org/userfiles/202109file/2021090820174770554.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/tidonupinoredofalazo.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/saxopigasufegijozoweb.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/monuwawul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=nordvpn+premium+cracked+apk+downloadPDF 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_off0000c5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5DF 10732 bytes
SHA-256: 86f9753d6a801b2c6215d8c023977a9942ff1f91a2b06f80818aba85f5ea17d0
font_01_sfnt_off0000de82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF694 16056 bytes
SHA-256: 91bcb47a9d91fe031c9c97c2f92b6e3b9d57fa8bbf395b6fbdc115523c5102f6

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