Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbca6b1e16853a10…

MALICIOUS

PDF

85.3 KB Created: 2021-09-18 12:59:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a5d1fd38402d99d037f4c564941c0306 SHA-1: 03352d2e9add69acd24d64aa2508bae3102e409f SHA-256: cbca6b1e16853a105891aa83c7c756ea6d5cd3070c98d1ae22198ae7a2916b20
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting and are used in link farms, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content are consistent with attempts to lure users to external sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=difference+between+pull+and+push+marketing PDF link annotation
    • http://solyaris.pro/admin/ckfinder/userfiles/files/77551795674.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/65574492793.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/18370708799.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/8639219417.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/67243054004.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dupuguzofilojolavi.pdfIn PDF document text
    • https://tavio.ru/files/file/jejurutinazofiduxixopazuj.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/pesopapawoporodizalute.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/gitisavezamuxotujolom.pdfIn PDF document text
    • https://camelcarpet.org/d/files/79280536589.pdfIn PDF document text
    • http://electric-kernbichler.at/21123156736.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/66863725890.pdfIn PDF document text
    • http://shoreluxurylimos.com/userfiles/files/65071123051.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/suwifumogupewubekopig.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/16201741160.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/fizuxilubenunuwe.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/09/09/ziferibuzomalegeza.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/45966516995.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/d37fc9c0181cca4373e1e720197cdb4d/xaseji.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/1975586634.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/22217909957.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/25906987544.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/jojazivapogi.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/togubirotadelu.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/xilisimosanazikelu.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_off0000e6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C6 17764 bytes
SHA-256: ac49ba65d9e7ef42eacd386986a3b4cc749fdb284baaad07ae916950b7df933d
font_01_sfnt_off000114b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B6 11368 bytes
SHA-256: c33ec75fed7d22c6cb11da7e65c4eba39a226dcce4c05828d0a1d0c2bdecda90
font_02_sfnt_off00012eee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1