Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb23e7ae07707c49…

MALICIOUS

PDF

83.4 KB Created: 2021-09-13 17:23:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9bc9d9d0c05ac6a79079b0a3d2d47824 SHA-1: c40336c242a13df9ddbd615c00380f4f94c22236 SHA-256: fb23e7ae07707c49ce719d2e91ab9dda49d2913b1bf89632fd5ac30f52700e2c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a high likelihood of this PDF being part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://psihodesk.ro/ckfinder/userfiles/files/vegubag.pdf In PDF document text
    • http://jongauger.com/userfiles/file/dasopirigob.pdfIn PDF document text
    • http://vrajacreation.com/uploaded_files/userfiles/files/gezorozame.pdfIn PDF document text
    • http://ficfart.org/userfiles/file/vemoxujadilaluso.pdfIn PDF document text
    • https://manhalhealing.com/userfiles/file/tonobupimavelezisudolu.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/59412305976.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/somogoxipuxiwuv.pdfIn PDF document text
    • http://heizler.hu/files/file/31283711779.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/49688570268.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/2698906935.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/koburajogezopek.pdfIn PDF document text
    • http://24cvety.ru/upload/files/186860995.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613032db452b6---66194624553.pdfIn PDF document text
    • https://hgb.se/filer/file/46040511294.pdfIn PDF document text
    • https://matraci.info/UserFiles/File/ravalikifuxomakemapob.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/22052420464.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/giwepobojo.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/54217028364.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc6664a940---terusizaduvanubudara.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1631002922.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/wisoworemi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=best+racing+games+ios+2020PDF 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_off0000e00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00B 10824 bytes
SHA-256: 760039234020a3dc4f4df69b165bc4558c6dc0f27c0bca4ef6eb4931ec149699
font_01_sfnt_off0000f916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF916 18164 bytes
SHA-256: 54d961cb94a71cb5eebbd3d902a1363a74f3444e18aa9267459dc6af4cf258c1
font_02_sfnt_off000127c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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