Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d4941f352ad22d5…

MALICIOUS

PDF

81.0 KB Created: 2021-09-13 07:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 204cc57dde161bfb765da75a20b2ffe0 SHA-1: 06f704cacad3546aee31a9062cb8b807da9e9878 SHA-256: 4d4941f352ad22d56736d49d652a84b0161b06c4508202673265c099e975f01d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external links pointing to disposable domains, characteristic of a link farm designed to obscure the final malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware or visiting phishing sites. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://maffart-guy.com/userfiles/file/55083803841.pdf In PDF document text
    • http://sunriverps.com/data/editor/file/kaputidi.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/48895470273.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/78028679279.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/16995916009.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/72175999297.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/53619886226.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/mezimoni.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/93542165555.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/kozudajoji.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8a9d70c55---wepewopadefamabimo.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/xugakuro.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/xejozubalobuf.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/nasudupolesajilado.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6bdc2daba---58453692762.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/jobajezexijebiwonup.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/26650954163.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/ditalat.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/mimonewujufupalepebulelav.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/tonuwaluwedemop.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/ligeleguwopu.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/84155198545.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/webaderutir.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/kaxusura.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=rujuta+diwekar+pregnancy+notes+pdf+download+freePDF 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_off0000d3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CD 11364 bytes
SHA-256: 61c79d528f5bf4ed8030303d59172b88fcb47d903d27d0d3f0023d04441e7033
font_01_sfnt_off0000ee81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10693 17980 bytes
SHA-256: 96125ff6e78c9c00d9e3b3e8193dd70c01ac72a91249146549ffcceccc0c4be8