Malicious PDF — malware analysis report

Static analysis result for SHA-256 17011ae17656e9bc…

MALICIOUS

PDF

76.7 KB Created: 2021-09-17 02:54:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3e496de14ee9a250fa217c6f3a3ba077 SHA-1: 36b0de1a2de4846d9513c75d3792b90b79451902 SHA-256: 17011ae17656e9bc5adcd242f5e04600c29bbed275772bf951b7a34818471ca4
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, suggesting a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms this behavior. While no scripts were extracted, the ML classifier strongly indicates malicious intent, likely to redirect users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 4

  • 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 http://tns-china.cn/editor_upload_image/file/85620232514.pdf In PDF document text
    • http://beautifulmoda.com/userfiles/files/36921033198.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/kuralor.pdfIn PDF document text
    • http://bbmpva.nl/fckassets/file/59160765419.pdfIn PDF document text
    • https://shivajigrihnirman.com/singhania/downloads/file/buzulekisije.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/83572101805.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/70722331912.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130cf7452a31---naxotalewif.pdfIn PDF document text
    • https://pastijptoto.com/contents/files/86281209491.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/81c29d96a757fb5d636fc2b568abafab/4944406801.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/83243213882.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/80975398826.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/20512270334.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/bimis.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/koxepizuda.pdfIn PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/mujajilikabimogapif.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/sutakifaxuropigobupep.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/82911346638.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/79097700460.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/keguru.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/wuxemurasufasebogubewi.pdfIn PDF document text
    • http://naviway.su/upload/files/jofepelofiwasi.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/65979713324.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=euro+truck+driver+2018+modPDF link annotation
    • 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_off0000c8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FF 10796 bytes
SHA-256: c0c5e0c678ab7fac6ca488f07b9e076ef23eb7c43b06e1771b8c5f04e2613143
font_02_sfnt_off0000fa0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0C 16872 bytes
SHA-256: 49f64c323585ce77409986e2509e4a5e84d26238491c4dcfde081976fe33f4c8

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