Malicious PDF — malware analysis report

Static analysis result for SHA-256 37a18d529690023e…

MALICIOUS

PDF

70.5 KB Created: 2021-09-17 17:35:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e1b69baa4e1a435e7927f8bad0d7d0dc SHA-1: d8d3eb22e0cc4d1037aee9eda4e5b2b53dc2caac SHA-256: 37a18d529690023ea5b08dd0702875ae13905dfec552786d4296901f72d7110f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file that contains embedded JavaScript, which is a common technique for executing malicious code. The PDF also hosts a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further malware or conducting phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/96926594314.pdf In PDF document text
    • http://atya.eu/files/file/68937516606.pdfIn PDF document text
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/ruruwewizafikukiv.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202109071106256453.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/856109445.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/laxagafuxipewu.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/resumikimetetizuvako.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161339001d8990---83595897221.pdfIn PDF document text
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/pusaguviduli.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/26369051873.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/36368575056.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/risod.pdfIn PDF document text
    • http://wenxuezj.com/images/File/29899442785.pdfIn PDF document text
    • http://hbaoge.com/upload/files/47485996974.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/wetadupolivojuli.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/sikukutomevigukeweminome.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/t1741fbeppta536rhpp8ntena4/56554168993.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/88894819328.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/84545419546.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/bubowomiketuravodu.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/9735849525.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=lehninger+principles+of+biochemistry+sixth+edition+pdfPDF 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_off0000b32d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB32D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3F 15536 bytes
SHA-256: 5d8e47764c9eb0828ffeb2501ba824784ae4b55e6638b73a4f4652abdb388f92
font_02_sfnt_off0000f26f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26F 11216 bytes
SHA-256: 0a3df03ff5f2c222158d1e84d3573d09fda84b6c1cd95750a3013339c6fd82cd

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