Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b94a651edbec68f…

MALICIOUS

PDF

70.4 KB Created: 2021-09-30 19:56:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6d722b628fe009781bd038eda984414e SHA-1: 9d70752e22389ae2b663037be2f95b78a583c549 SHA-256: 2b94a651edbec68f649dd050edf836841699e3bde27cbde4d6d1a806f0d7d175
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains hosting PDF files. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of link farming on disposable hosting, suggesting an attempt to obscure the true malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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.
  • 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://tdfstore.it/file/fitikago.pdf In PDF document text
    • https://sardavetri.it/userfiles/file/duzigetomojasamol.pdfIn PDF document text
    • http://spprp.pl/userfiles/file/ginitet.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/wefekezirejoluguxiru.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/58756377447.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/81912638362.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/xuloragijinugokununupuk.pdfIn PDF document text
    • https://mahae.hu/files/files/827377225.pdfIn PDF document text
    • http://123flower.doweb.kr/upload/files/75004911046.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/48291037795.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/56470628626.pdfIn PDF document text
    • http://clerus.hu/files/file/95026526852.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/2194465427.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152d1b53c923---jexapi.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/52712342250.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/84247381007.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/62535200468.pdfIn PDF document text
    • http://signauction.net/userfiles/file/30359772574.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/fb792ef2bff0cc00ea9bd7efebba0fc0/letororeloxa.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/17399757111.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/56739964057.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/76209241878.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/25834344560.pdfIn PDF document text
    • http://domuran.pl/files/file/vubeturuxiximajajeduladov.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/fesasenatum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=best+pdf+editor+apkPDF 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_off0000b0f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC902 16884 bytes
SHA-256: 1d86e5e8eb355f8b660841998997806877530f399ea79969549414e5e4e42c66
font_02_sfnt_off0000f476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF476 10488 bytes
SHA-256: ca0c72276d77fd8a30b72a8fc1cb08f226fef310dd32e9d9ec4bb234a65afc15