Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e21eea52188adcd…

MALICIOUS

PDF

87.6 KB Created: 2021-10-12 09:30:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7924d4c55e7979a2748b89ad92d5e946 SHA-1: 35bf389631315348f6d5061873353c23bad51ee9 SHA-256: 0e21eea52188adcd271dfbd3cc7345b27952c3645dcfb0e0eed380e9ef5b7794
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The presence of numerous embedded URLs, many pointing to PDF files on various domains, suggests a link farm or distribution mechanism for malicious content. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating an attempt to obscure the true malicious destination through redirects and disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/uvau6vvirkrhclukgcsedlta32/61647244023.pdf In PDF document text
    • http://labsshop.com/d/files/97460552805.pdfIn PDF document text
    • http://tdjl.com/uploadfile/file///2021091010101983.pdfIn PDF document text
    • https://pacientes.quiroser.com/UserFilesQUI/file/dogejuxokasopaduwigiz.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/zijoxepuk.pdfIn PDF document text
    • http://erpos.sk/data/files/domiregivudif.pdfIn PDF document text
    • https://tivirtual.com/userfiles/file/jonikerabopiden.pdfIn PDF document text
    • http://sasnowosielski.com/ckfinder/userfiles/files/metuxajaduvatavu.pdfIn PDF document text
    • http://semanbio.com/upload/files/niwagedolakagupog.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/75402818734.pdfIn PDF document text
    • https://sklepbonus.pl/userfiles/file/22782333144.pdfIn PDF document text
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/kipujalif.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1632592505_4129bc07e7.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/47438117563.pdfIn PDF document text
    • http://tottazo.com/userfiles/file/18910518617.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161494b1ed8f2d---25385635533.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/rebatobugezapelezepakug.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20211001092628.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/botubopufokijezojiwili.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/xizixulalidavali.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/rasevivaroloduv.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/7xhmvLXWVJc/uplcv?utm_term=48+laws+of+power+pdf+full+versionPDF 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_off0000ebe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE6 10836 bytes
SHA-256: c0bfb78a6872755c9cb20db1feee84a64de7bdaa3dfca519615ce48746e2bfcf
font_01_sfnt_off00010515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10515 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D27 19104 bytes
SHA-256: a01354ae91f941e64ed514c66b820928444270eacde8fe01a2f8c84c4e33188e

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