Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f9354b4fd564600…

MALICIOUS

PDF

71.1 KB Created: 2021-09-18 21:21:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3099bf4ca3958cfa898f462be8ae8dfd SHA-1: 336ff738b136f34a7b49ffdbbd1ed92757fac8a1 SHA-256: 4f9354b4fd564600c2b1a75288f542871bb2697845fa122a259fcd58a682b945
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains an embedded link that redirects to a website offering software cracks, a common lure for phishing or malware distribution. The ML classifier strongly indicated maliciousness, and the PDF structure includes multiple external URIs, suggesting an attempt to direct the user to a potentially harmful site. No scripts were extracted, but the presence of the link and the ML classification point to a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://taksis.lv/taksis/userfiles/file/datunowibinadenenigomowa.pdf
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/jovosipozi.pdf
    • http://chiengthai.com/file_media/file_image/file/velozuwufurobijifopegu.pdf
    • https://shreenatharcade.com/userfiles/file/ranetutiz.pdf
    • http://kvbm.org/pds/userfiles/files/jijepujexonoboxubusob.pdf
    • http://wagnerpc.com/userfiles/files/labibibulitum.pdf
    • http://erh-hu.com/userfiles/file/jewavikedukexanomekorava.pdf
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/lubamulowodirug.pdf
    • http://domplus.su/userfiles/files/nediresof.pdf
    • https://mancomunidadvaldizarbe.com/userfiles/files/veregijepamilen.pdf
    • http://kientrucphatloc.com/upload/files/11776974444.pdf
    • http://geobigoni.it/userfiles/files/dutagenabegetijite.pdf
    • http://kleiberit.ru/files/file/vubekudupodadapil.pdf
    • http://es-manzokudou.com/yamituki-n/uploads/files/tipesolanetonutunupi.pdf
    • http://1careglobal.com/upload/files/xixik.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138c50552669---jebomiseziponixav.pdf
    • http://chanhbon.vn/media/ftp/file/xapunizunovajuta.pdf
    • http://dermatologomiguelgallego.com/miguel/fck/file/70190282039.pdf
    • http://cmtl.in/uploads/userfiles/file/file/jesowizigubokufuvuguda.pdf
    • http://naszemotyle.natura2000.pl/imgturysta/files/18143099503.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3b9ae45a0---21252111079.pdf
    • https://dogodanang.vn/uploads/image/files/wogufaz.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=animation+composer+after+effects+crack
    • 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_off0000b6ad.bin
da34fa9b4ca75ed74bb4929bb38082cd65403d0c2ca044132450003523b1187a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB6AD 15440 bytes
font_01_sfnt_off0000de00.bin
4c86745e102846a0385fa0dfd3f41733986c49fd6b16a5ef8c9b7d303e4980b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE00 10668 bytes
font_02_sfnt_off0000f684.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF684 16792 bytes

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