Malicious PDF — malware analysis report

Static analysis result for SHA-256 da8bdb8a55da958a…

MALICIOUS

PDF

71.6 KB Created: 2021-09-26 08:47:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cb8e99bd5001c2ef2cda04ae3551129a SHA-1: fe48d22b01c4362657e68fa74e07a6410b601438 SHA-256: da8bdb8a55da958a482c5b10633fcfef006eb0794f57639225721b57cd926488
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JS points to T1059.007, and the overall delivery mechanism is consistent with T1566.001.

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 http://lctrading-gmbh.com/ckfinder/userfiles/files/kexewunekagarus.pdf In PDF document text
    • http://moonlightmontessori.com/upload/files/7807510755.pdfIn PDF document text
    • http://phukiendoxe.com/media/ftp/file/9051010024.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/90259556265.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/sifufuvejofokupavanudov.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021921225102235.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/58537280050.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/42070361481.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/61005457899.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/57250673937.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/f818qutgt61rubabu7ltd66gl8/mesozitenafufusijobadixe.pdfIn PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/nerawa.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/99339902591.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/56795011502.pdfIn PDF document text
    • http://airfa.it/userfiles/file/72416879583.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/3851115586.pdfIn PDF document text
    • http://lerucherdesanges.fr/userfiles/file/6629834961.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/rifigesunovoxivesazikeli.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/21634687312.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/66899951800.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/54223261859.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/9684626285.pdfIn PDF document text
    • https://cplastik.eu/data/cms/file/zadafibofuxodebifa.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136829f8f735---pubetinizapukiwife.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=android+tv+app+for+live+sportsPDF 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_off0000b4ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4BA 17172 bytes
SHA-256: c21a880198ae22249f1cecf824ee30a8a9e7ef95c820104d2a56c048fa38dbe9
font_01_sfnt_off0000e04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04E 10540 bytes
SHA-256: ad253bfbe34d2b0120a7975e307c271984fd7239503cd9267d184af71d1fb8ee
font_02_sfnt_off0000f878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF878 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1