Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7f2c6a19b90a342…

MALICIOUS

PDF

86.2 KB Created: 2021-09-09 12:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 436a53aaf7fc9877104a7891fa0dedc7 SHA-1: b6239d6003aeec0a49c316606c88a6fa629f585f SHA-256: a7f2c6a19b90a34268115e60afd67497a0805d54cda1e3393ae7b3e8b1debeca
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to potentially malicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to obfuscate the malicious links or perform additional malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://unicorn.mn/js/ckfinder/userfiles/files/sewerijatofop.pdf In PDF document text
    • http://megaprestige.ru/uploads/files/36347691976.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/mulelazivow.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/zefuganupagarim.pdfIn PDF document text
    • https://medpressa.ru/files/file/nepuguwedin.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/46135002226.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161339f6d73908---mogonajiwa.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/81502791088.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/60333814456.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/bexubulolonobubidijox.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/84402484619.pdfIn PDF document text
    • http://devveb.net/userfiles/file/53771928373.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/39356168739.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/salisogaredevejisosalede.pdfIn PDF document text
    • http://askaudit.ru/price/10974555458.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/punedinivibidugezudagetot.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/xogixijopozitewewem.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/91592611919.pdfIn PDF document text
    • https://letajicikoberce.cz/userfiles/file/81424634090.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210906080628.pdfIn PDF document text
    • https://asiapharma.la/files/files/fuxirosugajodo.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/kifazifovuxosoxatajanaxew.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/92763122807.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/notasutedenujemi.pdfIn PDF document text
    • http://komodovo.ru/upload_picture/kijidif.pdfIn PDF document text
    • https://kirmatas.com/userfiles/file/pedalaxamaradari.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=123+tamil+songPDF 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_off0000eae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE6 18460 bytes
SHA-256: 5e142621cecd45df319adf18a16afbe87079391001af311281766c3a57cb03a5
font_01_sfnt_off00011b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2B 10468 bytes
SHA-256: cba5aae7d1229175a3c129a063b10c8f66058399e59dde267fba1d28d1b42d99
font_02_sfnt_off000132fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1