Malicious PDF — malware analysis report

Static analysis result for SHA-256 d40c1e5d2a4e0446…

MALICIOUS

PDF

72.9 KB Created: 2021-09-30 14:20:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de5aa1acd0853a82ee6b966cbaa5a070 SHA-1: 452a905eccd97f7a5bc055e4da4e0aa35621ec73 SHA-256: d40c1e5d2a4e04467665fb27d2c855cf60ce3a92b7d5a346ad82ed670d6ce879
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 users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript (T1059.007) and the nature of the sample as a document file point towards a spearphishing attachment (T1566.001) delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://fishngrill.iorderfoods.com/uploads/files/29130196932.pdf
    • https://cortopolis.ar/userfiles/file/katejeponodemuviwidorulo.pdf
    • https://yakin-surewin.com/media/file/derasavugoxexur.pdf
    • http://thaiurethane.com/userfiles/file/38636964744.pdf
    • http://studiocinti.eu/userfiles/files/80936216244.pdf
    • https://aspirans.com/files/file/67062533368.pdf
    • http://www.scea.edu.mn/ckfinder/userfiles/files/63966429828.pdf
    • http://allivecoat.com/userData/board/file/detawefeb.pdf
    • http://tomboy2.com/images/library/File/tebufeditu.pdf
    • https://coop-alternatives.fr/images/images/15447012959.pdf
    • http://kimura-shihoshoshi.com/userfiles/file/6759829244.pdf
    • https://gameadvisers.com/js/new/fckeditor/userfiles/file/5135331194.pdf
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/99590095920.pdf
    • http://joesservicecenternj.com/userfiles/files/61462106440.pdf
    • http://maximaviajes.com/FCKfiles/file/rapubawita.pdf
    • http://kartywspomnien.pl/uploads/assets/file/lazunokegedeguwosojesuxiw.pdf
    • https://nomaquito-travel.com/editor-images/wevebajulux.pdf
    • http://diversecityuk.com/userfiles/file/taresekop.pdf
    • http://anhbanglaw.com/userfiles/file/29093195956.pdf
    • http://dymenahealthcare.com/upload/fckeditor/file/jedufako.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/a103b9c7f9672b514bb0a0eef14452b0/setufeberimofema.pdf
    • http://yishiweb.com/upfiles/files/20210908_221127.pdf
    • https://jf-orvalho.pt/userfiles/file/dexaguxatuvemak.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161538a4a34c45---70074926424.pdf
    • http://cycling-software.com/files/file/vumajupikevibijusonu.pdf
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/xitakekojopugani.pdf
    • http://sonsuadogo.org/Images_upload/files/wupetarudam.pdf
    • http://ilsungwarehouse.com/userData/ebizro_board/file/sagulewijem.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=partidas+de+ajedrez+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8b6.bin
054d736b4786d3371cf68a85f7576b04abb967e02dab0592411b8bca1d61087b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB8B6 17504 bytes
font_01_sfnt_off0000e609.bin
b25b40181d6fa46fdebc5d09182b1b997be335d4a6dc1d1c737dee7b24969e3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE609 10412 bytes
font_02_sfnt_off0000fdc1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC1 16792 bytes

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