Malicious PDF — malware analysis report

Static analysis result for SHA-256 759ec5e2ad883d2e…

MALICIOUS

PDF

79.6 KB Created: 2021-09-22 10:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 02bfdd92cf65249fe9e3d336125fbf85 SHA-1: 24fe0fc35e0ecd3895961dd5c0e88de84e3b36ef SHA-256: 759ec5e2ad883d2e236232242bf81efb325a60ac4a94fa4a50b2ed3c905b62aa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links align with common tactics for luring users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://archism.ru/uplcv?utm_term=gta+vice+city+download+apk+and+file PDF link annotation
    • http://cuspsurgeons.com/userfiles/file/jekuwuvoveje.pdfIn PDF document text
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/48308753355.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/24616380396.pdfIn PDF document text
    • https://mauspro.net/upload/files/rurawajotokig.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/12262870916.pdfIn PDF document text
    • http://hcwan.com/userfiles/file/gesujaxedabaji.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccae882dc0---26137987233.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/mapivimi.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/rudiduruzovogajiba.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/jewajedegok.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/ridoz.pdfIn PDF document text
    • http://addisonplaza.abwingsmd.com/uploads/files/vosesinowowarumofog.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/4f843cd2cccdaad412e7b595334ca105/nugupuluvow.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/diwimovifidi.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/f606bbabcc418d11cb6cc671346687a0.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/tasixudugikinazidoxos.pdfIn PDF document text
    • http://ossokahve.com/upload/file/jewikutapozal.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/revibawepager.pdfIn PDF document text
    • https://terracell.pt/images/file/63356608307.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/4688123294.pdfIn PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/70237398224.pdfIn PDF document text
    • http://babamoleskine.com/files/file/pasedekajeninepelewede.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_off0000d409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD409 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1B 17004 bytes
SHA-256: 3754ef0debe93d55056929efd6eb4d67b0fc7844c15d22098bfb010fc875103f
font_02_sfnt_off00011822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11822 10744 bytes
SHA-256: 3a0ce9e5f97c0dd3ae8504754c76ba58c282cc65f9b73a6961ab363e382543eb

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