Malicious PDF — malware analysis report

Static analysis result for SHA-256 3568851121c441d5…

MALICIOUS

PDF

71.8 KB Created: 2021-09-22 10:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f3daa499ab95c3559db347838f823d49 SHA-1: fcc93faf61f0d2b070cf940d63644fdd2ab28a4b SHA-256: 3568851121c441d537ab7080267b69ca0b9697f59a94fd99d6db294e25f400b8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to suspicious domains, suggesting it functions as a link farm to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cancelaria.pl/galeria/file/vijodikul.pdf In PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/vinajum.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/66123237893.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210919084411180.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/tugamegepadifurakelelu.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210911165208.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/17037057637.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/46914378773.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/18499471784.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/mubarufowigubegudi.pdfIn PDF document text
    • http://precisao.org/files/files/semusalaretekevafov.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad532c6aca---redatavunaxiviral.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/gupikarawuwiladixuwezowiv.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/f2aac3252d9fac384c458b5fd0bf1cb5.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/nonunopewetaleja.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/jidejatumi.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/wejawinemulaboj.pdfIn PDF document text
    • http://lehnerkom.de/images/uploaded/file/79582000176.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/55755530726.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/momotukutoki.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/70460186585.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/31230295269.pdfIn PDF document text
    • http://bdn10.cz/files/file/73995375265.pdfIn PDF document text
    • http://islenapuntos.com/campannas/file/xesopuxedodij.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/77739537041.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=vpn+shoora+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_off0000b6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6EC 10220 bytes
SHA-256: 5ac8f3c6fbba9703ecfb45d20c60a14a9031b84ad04ef8336ab89f71c7a9a664
font_01_sfnt_off0000cdcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DE 17296 bytes
SHA-256: 81b2a5b27a0523e244256e427fc0e619924ccbc7a156cd450321eb9fde2ce82d

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