Malicious PDF — malware analysis report

Static analysis result for SHA-256 603f18050653afa1…

MALICIOUS

PDF

85.6 KB Created: 2021-10-09 03:24:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 296b4651ae354c80c76cfc161bbffebc SHA-1: f7a364ba71addea24b58aa6859c6684790505b9a SHA-256: 603f18050653afa1197e86e26d95477be22d11f320a69055b805c459f9b160a9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to external domains, many of which are hosted on disposable or low-reputation domains, indicating a link farm designed to distribute malicious content or phish users. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment. The ML classifier also flagged this PDF with a high probability of being malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pistant.ru/uplcv?utm_term=synthetic+division+steps PDF link annotation
    • http://oookub.ru/upload/fckeditor/file/53512902856.pdfIn PDF document text
    • http://dc-a50e0b1dcb2e.breakthrough-nutrition.com/userfiles/files/nozakupomegatetewagak.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f048f83b22---61679496835.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/98072203715.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/48274739962.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/lurev.pdfIn PDF document text
    • https://klaipeda.cvzona.lt/resources/img/files/lomagijumodozuse.pdfIn PDF document text
    • https://istanajp2.com/contents/files/46894885813.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/jerufave.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/59218492845.pdfIn PDF document text
    • http://marymo.ru/uploads/files/farakiwe.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/xivewomur.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/9974431502.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/sarelul.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/repajipifabuxavovogel.pdfIn PDF document text
    • http://kursverwaltung.fit-n-essen.ch/ckfinder/userfiles/files/5828223997.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/denineborefizuluzulum.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/48768756427.pdfIn PDF document text
    • https://svenjakretschmer.com/ckfinder/userfiles/files/45452935043.pdfIn PDF document text
    • https://limsurempat.com/contents/files/rurifegonodorakizutod.pdfIn PDF document text
    • http://twtime.com/uploads/files/202109232154408625.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/44617409499.pdfIn PDF document text
    • http://budka39.ru/files/xatoki.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/wirizuperetorewuru.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16136f1764f53f---fotumevikax.pdfIn PDF document text
    • 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_off0000e2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CA 20332 bytes
SHA-256: 986952ae6b49b302990c7825f0ff7e4be715ba7f475b39177cbb67e07ec3e059
font_01_sfnt_off00011852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11852 10556 bytes
SHA-256: 5ab5de08dfc3c15688ffc68c6166a62d4434f1909da305c13bedfacd1a8cc252
font_02_sfnt_off00013062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13062 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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