Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcee8e97a0bec6e9…

MALICIOUS

PDF

70.2 KB Created: 2021-09-23 12:37:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6c4085a7a553e585800fd992e1fd967a SHA-1: 17972713e8ad4e00a90b2b15269bf7ff8c5d3a93 SHA-256: fcee8e97a0bec6e9420fdd8b70fc8702e67687bd7e34dca70174e19c74e63585
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. Heuristics indicate it functions as a link farm, hosting numerous links to other PDF files on disposable domains, with one URL containing a UTM term redirector. While no scripts were explicitly extracted, the nature of the link farm suggests an intent to direct users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • 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://crysiq.ru/uplcv?utm_term=derivadas+ejercicios+pdf PDF link annotation
    • http://isystem.hu/userfiles/file/dazenawikipopipi.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/dozajajoforofo.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/53982677150.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/83970622101.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/bumidovodobesi.pdfIn PDF document text
    • http://www.77ice.com/upload/files/54257845586.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc89586cc5---nepopumuwesosib.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a422cb91cf---pibijexoza.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/88322253568.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/zinikaditikidu.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/mebazivuzusavizevejuju.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/sizifumo.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/mipevudinomusu.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/67122742766.pdfIn PDF document text
    • http://gotween.com/userfiles/file///fanivitopit.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210901095549.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/tigetiponugogibajan.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/36311366233.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/32932018810.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210917025031.pdfIn PDF document text
    • 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_off0000b166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB166 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC978 16996 bytes
SHA-256: 8c72fa4aaaf8025ee17e10fe3ebcdb6cb4db78c29aad7e45110c3e4b22d82c55
font_02_sfnt_off0000f396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF396 10560 bytes
SHA-256: 5a1283a2ab4277aa9f54fa49a8abf01fdf40be4473bc5c5190c6bdc6ec9d3f52

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