Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3676b9f32171140…

MALICIOUS

PDF

83.8 KB Created: 2021-09-24 04:33:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d3b745f2f52125d1cc4f0e288926b24b SHA-1: 9b9aebf8d8f9c3d8171ec4dcbfa950e8eb221489 SHA-256: b3676b9f321711403961633ad149c729ccafde3178ca6fa17c15a613012426bd
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and multiple external URIs, including one that appears to be a search result lure for 'spybot search and destroy android download'. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, suggesting an attempt to obscure the true destination. The embedded JavaScript is likely used to facilitate the download or redirection to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://tipkeo.com/js/ckfinder/userfiles/files/65701598216.pdf In PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/36662207356.pdfIn PDF document text
    • http://lollanaclinic.com/image/upload/File/65788050188.pdfIn PDF document text
    • http://robedecreateur.com/img/files/23053745641.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75961262012.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/juteg.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/jomumam.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/puboxomekugafud.pdfIn PDF document text
    • http://jinyezi.cn/upload/wonim.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/14614040102.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/fevudador.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/48kolh400uqlke6plgsklnug05/mufelugajubife.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/deluwelotomuwigep.pdfIn PDF document text
    • http://smelawservice.com/file_media/file_image/file/wonidutesedojokufize.pdfIn PDF document text
    • http://kme-kme.cz/files/file/gobosotijerozogoxaxukig.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/pagopupabo.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/24675712595.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/nigisupekud.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/9f28ef0662b771e85a3000d9fa61a233/filegojulokejetulovaz.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/nezoxasubug.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/zolomupimol.pdfIn PDF document text
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/29018119599.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=spybot+search+and+destroy+android+downloadPDF 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_off0000e1a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A3 17844 bytes
SHA-256: 3412ac3825a77f15ddda642a35a6c8bccf77ac7ae23312c6c1a339e66fe22316
font_01_sfnt_off00011000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11000 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12817 11024 bytes
SHA-256: 840433a26426f2cb9197fef9cd2fa1b4b6d3cc7e9490ca61343a85233ae1dce0