Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2d0b998176dde40…

MALICIOUS

PDF

71.7 KB Created: 2021-09-19 10:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9b533294f7c8b0a517ddef3235c206fa SHA-1: 448fec6689e6c00302aecf8a1cc34ef3f43f481e SHA-256: c2d0b998176dde4015e7322dee225d3e75d0770f40cef89435f1496103af786e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crewmak.ru/uplcv?utm_term=ant+radio+services PDF link annotation
    • http://nurugelexport.com/ckfinder/userfiles/files/36675896959.pdfIn PDF document text
    • https://equalland.com/uploads/File/72769416045.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/zunave.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/81240409917.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/kulomidizegenitujobo.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/betojetidirudomusujel.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ae3cb6a15---34533989986.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/zixerunave.pdfIn PDF document text
    • http://araulmor.tel-cor.com/images/library/file/sexuwakur.pdfIn PDF document text
    • http://osayit.com/images/file/95934167702.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/naxepamezapusemiloguzuxu.pdfIn PDF document text
    • http://sun-tes.ru/files/file/jetamuxigino.pdfIn PDF document text
    • http://wieswioska.pl/userfiles/file/sisisibibukofibedemexev.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/18359988495.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/puluxeza.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/69857781921.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/58024065503.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89811641143.pdfIn PDF document text
    • https://servingltda.com/userfiles/file/jejukegagabonofexiwulub.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/69961146055.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/barunisuro.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/248723466.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/64094462365.pdfIn PDF document text
    • https://grupo.iberia.com/js/ckfinder/userfiles/files/39691734571.pdfIn PDF document text
    • 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_off0000b48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB48F 10364 bytes
SHA-256: 4e5d283803956e1eef4efef421f20eb28bbda5c7258c6ad9869aa616ad3193e5
font_01_sfnt_off0000cc29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC29 17628 bytes
SHA-256: 2c1af62a79921f7aa4d62d804c5069d2a41ecdf20576e5da817642effe9d0da5
font_02_sfnt_off0000f942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF942 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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