Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4e0d16bbd7521a4…

MALICIOUS

PDF

79.0 KB Created: 2021-09-23 03:01:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a7e4a8d24ace19e357e7457b88087d4e SHA-1: 9630c0c0f6c42d3b655f4c54862f7b0defb1e138 SHA-256: d4e0d16bbd7521a48b24da82e7c78841064b6e10de36c9067cf9992af686d596
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6181

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://habibitours.net/ckfinder/userfiles/files/71575396484.pdf In PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/wuneto.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/33977877665.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/xuximibadukuxirux.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/97961433388.pdfIn PDF document text
    • http://japanbizkorea.com/userData/ebizro_board/file/79629240867.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/fabodukurul.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/7234939571.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/8678482071.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/67729819541.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/digozewefabimawux.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/fatotewatin.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/jumufakifatudevuvusuzokaw.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/loxifamomo.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/61111593411.pdfIn PDF document text
    • http://somersetcountybar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18262621245.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/pinurebowiw.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/jizaxivur.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/35113346528.pdfIn PDF document text
    • https://ventadeterrenosagricolas.com/userfiles/file/33023187540.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/64770816489.pdfIn PDF document text
    • https://badoza.net/userfiles/file/rijazof.pdfIn PDF document text
    • http://idevoz.rs/files/divitum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=smartphone+projector+2.0+appPDF link annotation
    • 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_off0000daa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA4 10844 bytes
SHA-256: a9e8a4167105df7cabb243b5501999f3ae8e2ba6f5fb3ddc9238b17ae3bea63e
font_01_sfnt_off0000f38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38B 17356 bytes
SHA-256: 9fb553e8c4986a09903a2fc6b78ae4594875eb1f660aff153abf2aeb04d05948
font_02_sfnt_off000120e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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