Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcda057ef38d478a…

MALICIOUS

PDF

70.2 KB Created: 2021-09-13 01:58:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7bdf4f9b975ea5fdf922d45751b6648b SHA-1: 5cffa059f880f362b3b3b35a287496bace4949e6 SHA-256: fcda057ef38d478afbe3f87f44c2fa6d65bafaba0d0da702521de2110b956713
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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://coretry.ru/uplcv?utm_term=tongue+emoji+android PDF link annotation
    • https://hearing-outlet.com/uploads/files/202109100151508443.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/jaxemifuvuxusazibakajov.pdfIn PDF document text
    • https://sainaudit.mn/File/15251408203.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/sogatelumowexalomujubi.pdfIn PDF document text
    • http://vetsnab32.ru/userfiles/file/rufozeligozobibojokel.pdfIn PDF document text
    • http://skisun.it/userfiles/files/61736531674.pdfIn PDF document text
    • http://chongthamphucthang.com/images/news/files/muxibozut.pdfIn PDF document text
    • https://tallerescarrion.com/uploads/file/23023171541.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/geburo.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/jifojakofamupuzof.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/40011005011.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/73177034964.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109101649394046.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/gotezulivolikaxugogomev.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/161399b672f8a0---ragigezol.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109110750019313.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/jobevoxuburo.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/xofopofuladop.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/27251403862.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/lazasisoxini.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/sugaminijuxan.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/0d22bf51571c74d47bc5752154fa50ff/bulewugemi.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/35265055496.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/7391617353.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_off0000b632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB632 14504 bytes
SHA-256: 5479a9f08722e789407cde0e4cfc6f7a12b051de11d9aced4638ec0f124ec4d6
font_01_sfnt_off0000da5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5D 10472 bytes
SHA-256: 2639f405ae555b97d7a5063971f7ca4001f3e27a8514223d38bb93f9e29753a4
font_02_sfnt_off0000f1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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