Malicious PDF — malware analysis report

Static analysis result for SHA-256 fffa16e61d0d292b…

MALICIOUS

PDF

71.7 KB Created: 2021-09-23 14:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 828e6b18a0b2ed56d03a590be74c4063 SHA-1: 91f4ff9db2100f5d348770dfcf05f68becab66df SHA-256: fffa16e61d0d292b4ef4eb30f989ba7d992ea8df5768d0aa3b4e0b4e72851330
132 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 and configured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript suggests an attempt to execute malicious code or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9367

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.
  • 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
  • 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://nyig.com/files/file/89303192637.pdf In PDF document text
    • http://ls12368.com/userfiles/file/66529074642.pdfIn PDF document text
    • http://www.msjcongregation.org/www/js/ckfinder/userfiles/files/59372395276.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/29633882733.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/dofanabafumususareme.pdfIn PDF document text
    • http://halongwave.com/userfiles/file/11334860394.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/letutomeniwujenorusi.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/78402046890.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/38c9ce44587b8ab45a384d72e8ef4a3c/tozutaza.pdfIn PDF document text
    • http://irodaszer.lukinserv.hu/file/zuxufojexow.pdfIn PDF document text
    • http://beganijewellers.com/ckeditor/ckfinder/userfiles/files/xetabawalin.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/werademodifowufofar.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/40001158037.pdfIn PDF document text
    • http://atya.eu/files/file/sovovedoxap.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210901135844.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/sanopa.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/32622114670.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/19363386170.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/87429239038.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/pomigoguti.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/76914018845.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/xeraniguluralowax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=tutuapp+new+versionPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00F 18640 bytes
SHA-256: d2ea5ae3f358064ff81063c096687d091cbce2a0671c8735704ee25a269ea0a7

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