Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d9ee985f6a8ec96…

MALICIOUS

PDF

100.5 KB Created: 2021-09-21 01:15:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4b827cc2c1c623d58a4f382151daabab SHA-1: 47e2ea0086323a4af4d0e4bc257f2a112b13ee81 SHA-256: 6d9ee985f6a8ec9654e32caf6615128ee772e02e0090df0bc482ca382fc997ae
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, with a high heuristic indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, so the primary attack vector appears to be the redirection to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ccsup.co.th/uploads/ckfinder/files/6824257021.pdf In PDF document text
    • http://progfin.pl/userfiles/file/89500777052.pdfIn PDF document text
    • https://emmaushuis.org/pages/60771028151.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/20500343077.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/60829796166.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/95684134000.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/71008650987.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/94085741053.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109120525201676.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/luzawomaladoguxosuge.pdfIn PDF document text
    • http://sourceit.ke/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/nezubiduvilalorodelaw.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/86181377824.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/88341996037.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/vakigofetamujokotuzu.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/zakapimijuribadoso.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/161336452760f3---denoke.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/kometugufiwukogedupadaj.pdfIn PDF document text
    • https://turasmobilya.com/img/editor/image/file/74131977376.pdfIn PDF document text
    • http://nscenter.cn/upload/files/zolajewemoxikeg.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/80998815605.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/xebasine.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/20086988225.pdfIn PDF document text
    • https://mchs.kz/userfiles/File/rabafusovowafamadorazabiv.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/gosuxejasifibikajiva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=a+positive+word+that+begins+with+nPDF 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_off000124d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D0 18268 bytes
SHA-256: c404fc49fc4166930ccddcc235826ed6a8a370dd84e9d79e254d6c271302f80d
font_01_sfnt_off000153cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153CC 10900 bytes
SHA-256: 0182ba2b5874b540befedbcf77ec81aeb189c3a6f26ef4909e28ef075465479f
font_02_sfnt_off00016ca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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