Malicious PDF — malware analysis report

Static analysis result for SHA-256 189544489932b422…

MALICIOUS

PDF

105.2 KB Created: 2021-09-21 06:58:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4c095752adeac64ecb28471d2d69f701 SHA-1: c6cca2154b9051d89ff436d7ede3dd0d90d3702b SHA-256: 189544489932b4223bf21e47f12d55c9d2b74d8df277b05f1c332d553378b125
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious content. The heuristics indicate that this JavaScript is used to redirect to a link farm, likely to obscure the ultimate destination or to host multiple phishing lures. The ClamAV detection and ML classifier strongly support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/f561e7629a94dc85e8545caa0295194f/zedeteginosoje.pdf In PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/gavotimijigexopopebu.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/34887336622.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/50815762378.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/xegikopufulagoba.pdfIn PDF document text
    • http://tochalco.com/uploads/files/gemibuxerijagerewofeta.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/fonuwogawokatemizukobe.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/75112439361.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/51363773741.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133763dca7d4---32556165082.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/vafiposupenixepidi.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/nofuwinisokaloxijunawiw.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210912160225.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/fudofarodezid.pdfIn PDF document text
    • http://zhymwz.com/upfile/file/bixigiminaleso.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/fosizoxunopesijodewip.pdfIn PDF document text
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/70908394233.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/wuwigibonumozetejazoroti.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/24229141883.pdfIn PDF document text
    • https://stotex.rs/files/runedapimib.pdfIn PDF document text
    • http://isvpro.com/custom/files/gevedipevulu.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/30329532236.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/sosikapozenedejo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=vampirella+comic+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_off0001320c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1320C 20808 bytes
SHA-256: 01b79b595e4e9670e4d509198ad9a6ac07c75cde871828b0adf16687adf220ec
font_01_sfnt_off000167ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017fd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FD1 10380 bytes
SHA-256: 107c37528536d6999457405768b668a549ec095ab62ffaa5d670c0f204e2d5f8

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