Malicious PDF — malware analysis report

Static analysis result for SHA-256 de5eed3b3cf3e309…

MALICIOUS

PDF

82.7 KB Created: 2021-09-19 17:53:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4d3d7a0eca07d8d46dceed99809d4988 SHA-1: a7357bb1429a005c578008de24d1c35e6175e0f5 SHA-256: de5eed3b3cf3e3096ab2e60607c03e7ba8906e0f60f6eb1a44247bfa04d34394
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm on disposable hosting, with numerous embedded URLs pointing to potentially malicious content. The presence of 'wkhtmltopdf' in the metadata suggests it may have been generated to disguise malicious content, and the heuristic 'SE_LOLBIN_RUN_COMMAND' indicates sequences that could be used to execute commands.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://dondepodemosir.com/userfiles/file/5120880367.pdf
    • https://billionbosses.com/ckfinder/userfiles/files/25813356755.pdf
    • https://daiichitravel.com/uploads/news_file/83466767112.pdf
    • https://gulfb2b.com/userfiles/file/pibusanekelumolife.pdf
    • http://szguilong.com/userfiles/files/somajafari.pdf
    • http://mamitobe.ru/files/file/43060100984.pdf
    • http://spostojow.pl/userfiles/file/tirekiwan.pdf
    • http://tramtronbetong.com/uploads/userfiles/file/badoguxanamuwatob.pdf
    • http://sakem.org/userfiles/files/wofevenuxe.pdf
    • http://chokmanee.com/userfiles/file/sekafulidel.pdf
    • https://cooperadora.grupocreartel.com/documentos/archivos/lagaxezuwalusex.pdf
    • http://101-games.ru/images/uploads/files/19515866782.pdf
    • https://greenvalleykerala.com/ckfinder/userfiles/files/sarogebowapijut.pdf
    • http://deauville.ru/files/file/84840999736.pdf
    • http://kiavysocina.cz/UserFiles/File/texofegijapixadigipejogo.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/326092915894a252c4bcb53af51991ca/resikurakafav.pdf
    • http://aktien-analyse.de/images/File/42972399669.pdf
    • https://campfun.myhost888.com/upload/ckeditor/files/86923618168.pdf
    • http://charmingcurls.se/upload/file/bosuduj.pdf
    • https://pr-dienst.ch/file/vujiwajov.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416d5e43903---94599931836.pdf
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/zivulawonimeradunitude.pdf
    • https://www.zochrot.org/ckfinder/userfiles/files/51557529073.pdf
    • http://korsorlampang.net/user_img/files/30553114855.pdf
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/zabamiriforubafudoz.pdf
    • https://pr-dienst.ch/file/v
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=help+wanted+apk
    • 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_off0000e075.bin
8dcdbd8847ce3793c6de6340c7adb579965de63c9a983217896f6f0ac2144249		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE075 17920 bytes
font_01_sfnt_off00010f17.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F17 16792 bytes
font_02_sfnt_off0001272e.bin
0a11ed26861578a5f0a381c7045f24ef6a25dad4972a5ed11de7768cb256cbdf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1272E 10076 bytes

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