Malicious PDF — malware analysis report

Static analysis result for SHA-256 69db56031de0bb89…

MALICIOUS

PDF

73.4 KB Created: 2021-09-14 11:13:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 40abf7544b01e38a8cf938866db153d8 SHA-1: 2c5c09d2e2eee1d8eef822633804a14c923fc9ef SHA-256: 69db56031de0bb899c3dd767a081cee22006dad85bd732c0fe2480f9bc90e1eb
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to various domains, with a high heuristic score indicating a link farm on disposable hosting. The ML classifier also flagged the PDF as malicious. While no scripts were extracted, the structure and embedded links suggest a malicious intent to redirect users, likely for SEO spam or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 4

  • 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://fo-prefectures.com/pages/files/92775959807.pdf
    • https://rajnnuhiddje.se/userfiles/file/tadulajezevozarodufajaba.pdf
    • https://honghow.com/ckfinder/userfiles/files/keselefagos.pdf
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/razatemo.pdf
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/babiduxiladamevudotajaw.pdf
    • https://haisanquangninh.org/data/dulieu/files/fadisafudewema.pdf
    • https://ctapigroup3.com/contents/files/97319052388.pdf
    • https://luckysurface.itweald.com/uploads/files/6134e850ac6ad.pdf
    • http://strandedtattoo.info/file/21653717039.pdf
    • http://melabo.com/upload/files/dejonafizomip.pdf
    • http://allycatering.com/userfiles/penovasalek.pdf
    • http://cascinamana.it/userfiles/file/65570097054.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fccc6c05c---5498323242.pdf
    • http://www.workbythai.com/admin/assets/images/40440129060.pdf
    • https://dsverano.com/UserFiles/File/kupozuxiwufemivasawaravo.pdf
    • https://buzascsaba.hu/userFiles/file/kuxawevubawefogelarebub.pdf
    • http://goldendazzle.com/upload/quangtri/files/sikegapedefidejo.pdf
    • http://mygiftltd.com/userfiles/file/4597525176.pdf
    • https://partetesal.ir/data/file/nusim.pdf
    • http://honyi.tw/ckfinder/userfiles/file/xinudedupuvofafexaxinez.pdf
    • http://motocams.cz/ckfinder/userfiles/files/59065094203.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/qudp7j18dgo46ene79mnvacuv9/71079429171.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+stop+predictive+text+on+android
    • 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_off0000bc46.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC46 16792 bytes
font_01_sfnt_off0000d458.bin
42d950c024706ae9a38e5e7b1f99ed5efec36dd947cd84ae62adf3db1ef4f2f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD458 16724 bytes
font_02_sfnt_off0000fea7.bin
602c8d737120aea14e63e942bcfdf8f2843b77e009f2c19734f852363d3e15fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA7 10704 bytes

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