Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6050bebe01fe723…

MALICIOUS

PDF

75.6 KB Created: 2021-09-08 15:56:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: df534b6d72822d0811e9fcd1035d8f84 SHA-1: ee2d3ca398a168945036b427127c95671e5b6f77 SHA-256: d6050bebe01fe7233af1b92074665711a76aa49b0bc237a71dc4c8d08693aac8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links pointing to potentially disposable domains, suggesting an attempt to distribute malicious content or phish for information. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.tahitotfalu.hu/ckfinder/userfiles/files/xizilugovaju.pdf In PDF document text
    • http://3gr-group.com/ci/userfiles/files/57829299447.pdfIn PDF document text
    • http://dija.lv/public/userfiles/file/lexulotufuwomopo.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/zitikabesewosukaruzesele.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/27516876161.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/24352435352.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/wojogurulasizidojerosedad.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/86139275621.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/79738797329.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/62748484628.pdfIn PDF document text
    • http://rld-carbon.ru/file/turajelikase.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-6/20210906172739838175.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/58658755919.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/55341407627.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613294ae952fb---rojalejaxazed.pdfIn PDF document text
    • http://tochalco.com/uploads/files/padorukupelap.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/4472795403.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/kugipumosiladutoxibigejel.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/161326093df920---55619386525.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/liluw.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/fodebujevoxusupudufabew.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210903150600750787dg271g.pdfIn PDF document text
    • https://renault-service.com/userfiles/7245636128.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=ahsan+ul+fatawa+pdfPDF 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_off0000bf9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B0 18956 bytes
SHA-256: a106a28279d0a7562405e8db3b87431fd13bfac7d8c25442c46d1ef42161541d
font_02_sfnt_off0001099b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099B 10320 bytes
SHA-256: 413607755f48059854d01004dc6fcf429d92a2fbb99ddd82539a237c519a1c4a