Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dea06cdbe53859d…

MALICIOUS

PDF

80.5 KB Created: 2021-09-16 01:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: c99169e8ae442c062431c1e250c4872f SHA-1: 45c9d0717c3bdf1d1db3f49908be379dd0020632 SHA-256: 3dea06cdbe53859db146ddc814d96eacd3903dd2c503e3ba047783e86f0950e8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://pixomot.ru/uplcv?utm_term=install+windows+on+android PDF link annotation
    • http://ctnphrae.com/ckfinder/userfiles/files/ditilurovasiti.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/wananexepuwukikepukinubu.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/sabarixalefos.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/mevewebamasoj.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/piwaneteninebugaletezudu.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/netudepafut.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/nejanuxonutalifo.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/45956798037.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/97447196498.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/bazapeme.pdfIn PDF document text
    • http://hk-keber.de/images/file/ropirupuf.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/rurowivulilasafixajimek.pdfIn PDF document text
    • http://tochuchoinghi.org/files/liwijepukobaxebopesi.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/58281902050.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/422597739.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/48882763750.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/zojusujodifatarisofusafuf.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/28860600082.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/33723951287.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/11517221229.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/dibuxijebazedodozomisep.pdfIn PDF document text
    • http://damvua.com/damvua/public/images/files/fupavusivexu.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/bikox.pdfIn PDF document text
    • https://anfauglir.com/images/file/jiluxixakojin.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349fee7a724---mekawivumukudiduxizusesu.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_off0000d836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD836 10144 bytes
SHA-256: 93e18c8bc93113466cf4518c0aba7aaaa94d2a24cdff4d3988a5e29acef1239a
font_01_sfnt_off0000eeff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFF 17540 bytes
SHA-256: 66f337f62cefda96af9895a1c10ed090c085521351ed68615decb2188da022e3
font_02_sfnt_off00011c51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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