Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed6cf59b63d60848…

MALICIOUS

PDF

83.8 KB Created: 2021-09-08 23:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 693b898dd1336a0958261cca7b8fc557 SHA-1: 4c40a79022fe342c13d012e3a5f85a62e5332d6d SHA-256: ed6cf59b63d608483a86a2f9c5710c0f990517161b4a229bd5ac93b48e6b3e0c
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or contains malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to redirect users to a large number of other PDF files hosted on various domains, potentially for SEO manipulation or to distribute further malware. No scripts were extracted, but the presence of multiple external URIs and the link farm behavior points to a distribution or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://yodishit.com/uploads/userfiles/file/sojawazi.pdf In PDF document text
    • https://jatransfer.com/userfiles/file/246147924.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/36935941347.pdfIn PDF document text
    • https://worldtradezone.com/userfiles/file/15725951428.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/98831900859.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1ba15bb6f---2024788963.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/jafezijabusobuzavepapaf.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/61445520560.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/13613846750.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/lefatiremawoj.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/raxexixane.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dafumemeleg.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/45315333780.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/7907270178.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/16951378008.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202109061449219027.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210904172312000.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021090608162122.pdfIn PDF document text
    • http://zgic.ru/!upload/files/gifotusawepajima.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/83996940835.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/90742603960.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/kazuk.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/kenepilibutitidotepipa.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/27180069696.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=pokemon+omega+paradox+nds+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_off0000dc62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC62 10824 bytes
SHA-256: 5330caad3e21253ed1f7feefea3dbe5c1650c8c3cf095d190bf556ca55cc74a5
font_01_sfnt_off0000f53a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4C 19908 bytes
SHA-256: ebc2aa54441f45d4eedd3a615428b0ed6c6f4c5593a22166797f7bf03cfcbd24