Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b54a3f5e30c4f04…

MALICIOUS

PDF

70.5 KB Created: 2021-09-25 01:05:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ab6858034a248204aa7cf5a60a03e5e5 SHA-1: ed2dde96be138a9d5790aefbf6e70aff65181a73 SHA-256: 2b54a3f5e30c4f0471ca9b76ea6a5a7dd53aab06dc733637215c33b3c3421b09
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 hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF.

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://kaparatt.com/images/File/65463520142.pdf In PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/2452670304.pdfIn PDF document text
    • http://kd-council.com/upfile/files/20066967067.pdfIn PDF document text
    • https://ilonew.tasksplan.com/userfiles/files/43255256987.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/satigixalilinakawuvogo.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/temibimuporeloz.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/36101779624.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/podip.pdfIn PDF document text
    • http://gameometria.com/assets/ckfinder/core/connector/php/uploads/files/50183762128.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/jilowire.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/37112690719.pdfIn PDF document text
    • http://sunway.me/uploads/file/151035226654.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/25458202843.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/2512851826.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/puvinelufevilojekojoriga.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614b73d036429---45677886318.pdfIn PDF document text
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/sipugavodavu.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/jolewa.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/9527927447.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/vikanitukijisemugumukuleg.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/mitodanavinopeguz.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16148827c9dae8---motugavenavorikudula.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/xukotesubisop.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/gatopazimuzoxoto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=free+robux+generator+for+robloxPDF 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_off0000b427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB427 10448 bytes
SHA-256: 4c015da82161bab1d9bdb8d1a3990f57fa4da13e9ecb4c13ebe4a21ba5af54e1
font_01_sfnt_off0000cc08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41A 15764 bytes
SHA-256: a4b271d1d95cefca9422bc259dad1e34e63ae88e8a82f37b8701f5776757047e