Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b62e345235fa34a…

MALICIOUS

PDF

73.0 KB Created: 2021-09-09 15:34:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 4ef4607cbeebc44a8f9ff9f80df19c1d SHA-1: ee05c81748b3d0c5424334c5efb738a19bafea33 SHA-256: 0b62e345235fa34a8284de7ef2d02ec4f28c38ff1b3ec4750fdabfbf6f6c885f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous embedded URLs, many of which point to other PDF files hosted on various domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates that the PDF is part of a link farm, suggesting a potential SEO manipulation or content distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 http://chelseafoodmart.com/uploads/files/88657593319.pdf In PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131bbe7b4a88---mufeni.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/10476814898.pdfIn PDF document text
    • https://servauto.fr/img/user/file/genodozenow.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/zegawujuxanarazuzakomika.pdfIn PDF document text
    • http://unseretochter.ch/images/file/17941706900.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/filufowapox.pdfIn PDF document text
    • http://findusafranchise.com/files/files/43800981316.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/40674612087.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/givuwefe.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132c782601ce---pezufule.pdfIn PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/80392675534.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/050929168123.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/60775164212.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///27981064029.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/21897670486.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109081054042989.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/21358966931.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/wuxalibinusabewatuzefufo.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/xuzozafuduro.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/81908447769.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/wotegofovozokelupiwesis.pdfIn PDF document text
    • http://fgsconsulta.com.br/ckfinder/uploads/userfiles/files/ruxogu.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/xemibegitikazu.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/gedufilugutovirer.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/15285305432.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/numofaroponakerepadinifod.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/45296788329.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=pixels+full+movie+onlinePDF 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_off0000bbbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBBF 16816 bytes
SHA-256: 1da3d7d4e26fb5888fb856a9eebf7b75407fbbe10db4e46a8e0f6b3929f8eaad
font_01_sfnt_off0000e75e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF75 10284 bytes
SHA-256: 95b44514147e1d891aaae7b6e70c95e946c6c15a2f65be0e403455d69077a69c