Malicious PDF — malware analysis report

Static analysis result for SHA-256 1eab77d7af9056f0…

MALICIOUS

PDF

82.9 KB Created: 2021-09-09 05:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-24
MD5: f630a99cc3c1f6e0ad93790c9dc111d9 SHA-1: 5a90c95a32de8efc12c893e5b2b5a3c03685bf0a SHA-256: 1eab77d7af9056f0e6d574ad0170b74097676868a6ff830c0afdb5cdf976bc7b
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 0.9974

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 http://baiduvpn.com/upload/files/20943165421.pdf In PDF document text
    • https://kudamatsu.org/userfiles/file/zurekibonuzo.pdfIn PDF document text
    • http://104408017.linker.tw/files/wojepugewabide.pdfIn PDF document text
    • http://blueview.nl/app/webroot/files/userfiles/files/rujujaniwokaziv.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/86769304778.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/zipezopowatazibop.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76105200767.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/75443232226.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/33776960903.pdfIn PDF document text
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/fivaloririvane.pdfIn PDF document text
    • http://klenderbio.com/upload/files/ruvami.pdfIn PDF document text
    • https://tcremich.lu/files/files/fumutedopipofepevabeve.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371f1e7e954---10615187200.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/guxukorowozigewurewone.pdfIn PDF document text
    • http://pk.mo/userfiles/file/zulugogake.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/voxazepezilefawidotedali.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/perezaloxipo.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/45618695586.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/86923232831.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/29069820695.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/rivipiwufovuzizoxit.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/xijurekevimotaru.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/11900220859.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/35499510735.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/puselus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=best+groovepad+appPDF 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_off0000e0e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E0 10444 bytes
SHA-256: 5032be9b443991949f6a4c6fd44a11cb40adc737a4c59b8fed3a8f2a336ff30e
font_01_sfnt_off0000f898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF898 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AA 17344 bytes
SHA-256: 3f867c6feb2283f2593391b83161ddbcc556acef638bf3b6a6f08e37fd38ea65