Malicious PDF — malware analysis report

Static analysis result for SHA-256 24847259848bf199…

MALICIOUS

PDF

81.8 KB Created: 2021-09-09 10:08:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7f4b285090f905406942cebede59a188 SHA-1: 991fb7d532bafca415b068c2f229b2eb3954d882 SHA-256: 24847259848bf1995de1243186c8e7a9cbc37a70e2cfaf31881ef89293f4ab5d
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 and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is the primary mechanism for executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://irlanc.ru/uplcv?utm_term=best+haircut+for+my+face+shape
    • https://angkaganjil.com/contents/files/fikoj.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300843130c4---6989990588.pdf
    • https://houstoncoinshow.org/FCKeditor/file/rarutiluzutunifo.pdf
    • https://thuhuonglacquer.com/uploads/news_file/zonowemip.pdf
    • http://hondasushi.com/uploads/files/3434984591.pdf
    • https://qigoodteam.com/uploads/files/202109051023149615.pdf
    • http://geoplan.su/userfiles/file/wixiwonegulifitadavoremux.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613579ecf3686---fadesuvetite.pdf
    • http://mateuszkucharski.pl/admin/file/wadimipidegobariwediw.pdf
    • https://trainova.com/userfiles/file/57440706813.pdf
    • http://belniig.by/public/file/42758134504.pdf
    • https://birgatour.mn/js/ckfinder/userfiles/files/dawolokibifutelakex.pdf
    • http://sinorarechem.com/upload/files/difovofoperufijori.pdf
    • https://toocapen.com/files/suvuwowekizit.pdf
    • http://encino.ilovepokebar.com/uploads/files/16033309696.pdf
    • https://tectrongim.com/uploads/files/18726869395.pdf
    • https://www.nickelmarket.co.za/includes/ckfinder/userfiles/files/23522270045.pdf
    • https://araprinter.com/ckfinder/userfiles/files/fesabeva.pdf
    • http://artio.pl/files/files/26200004210.pdf
    • http://jngf.cn/files/file/91476792401.pdf
    • https://korovin.org/site/img_ufiles/3288542117.pdf
    • https://vayamcs.com/content_files/files/39755502948.pdf
    • https://sweetburden.com/upload/users/files/93330246671.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd19.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD19 16792 bytes
font_01_sfnt_off0000f530.bin
c18912b0b9aa0d9572baac7d4cfacff398f12ae87a74a89fc2ffcdfde0b4a20f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF530 10860 bytes
font_02_sfnt_off00010e64.bin
0a0873edd88aa8bfb75fdc769ec418369afbf591f090a222e39b0bc8f28a7ce0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E64 18272 bytes

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