Malicious PDF — malware analysis report

Static analysis result for SHA-256 52e3f5d3bb9997d1…

MALICIOUS

PDF

74.2 KB Created: 2021-09-10 09:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9c1659c7b7aa5409103c5b1e4984b78d SHA-1: dfde9e41f7229b03d15ea9469db9de97a6486e8e SHA-256: 52e3f5d3bb9997d1348eaf566ecf84f53b25673c7b372d37b91bbe4e613cc2bc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, suggesting an attempt to direct users to malicious content or downloads. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://huntic.ru/uplcv?utm_term=battle+chasers+apk
    • https://designclarf.it/file/duduteme.pdf
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/juzeloxuzesojavo.pdf
    • http://sumtinathholidays.com/admin/uploadfiles/file/59527592830.pdf
    • http://ndt-tl.ru/upload/file/lokox.pdf
    • http://infosierra.es/images/editor/87048349156.pdf
    • http://falconfam.com/ckfinder/userfiles/files/kovuloguvimisufu.pdf
    • http://sdes.in/uploads/milinelenuv.pdf
    • http://krukaiart.com/userfiles/files/dajunelilivesavubipok.pdf
    • http://mcdanielz.eu/files/file/mevubaxagosunediveb.pdf
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/13020132798.pdf
    • http://cyuanmei.com/userfiles/file/53686230299.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ba04ca994---3706866568.pdf
    • http://zajazd-broadway.pl/galeria/file/52462623594.pdf
    • https://sahodayabbsr.com/test/fckeditor/file/wokijafulebi.pdf
    • https://bankubezpieczen.pl/userfiles/file/zapejasevotowag.pdf
    • https://yoimart.com/upload/file/20210906042329.pdf
    • http://studiocommercialedelpiano.it/userfiles/files/mixopoditikedifiberunis.pdf
    • https://merohamro.com/ckfinder/userfiles/files/denemisefilazonunizinati.pdf
    • http://duef.ru/public/file/33017391236.pdf
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/zagipudi.pdf
    • http://kammatrans.com/userfiles/files/55482874624.pdf
    • http://jubileejec.com/userfiles/files/32382721728.pdf
    • http://antropolog.ru/userfiles/file/4148115262.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be1a.bin
2e8f8a4aebb94e4948b74f11bda91cccd1331f3d7f0aff91f44d0229c05fd141		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE1A 17552 bytes
font_01_sfnt_off0000eb87.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB87 16792 bytes
font_02_sfnt_off0001039e.bin
d09ae89f49cac119b22ce58ea89b72f479667f558ccfcf3ffe1808c5855057c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1039E 10300 bytes

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