Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe86711795bca83a…

MALICIOUS

PDF

81.3 KB Created: 2021-09-22 16:32:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 28e0274c202cd95fd19416232f830786 SHA-1: e957eaef584e9f7fd9b0d13408704cdf0d9e4faf SHA-256: fe86711795bca83a5dc40cd1c5dd9413acc8edb7df77f1fb0a1423e879a69c1e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with many pointing to disposable hosting and forming a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://softtox.com/new/userfiles/file/pavofigejedanagukibizuxi.pdf In PDF document text
    • http://cssh.es/img/file/volalabunekovibikopeg.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/wuguserusiretoledewodero.pdfIn PDF document text
    • http://screen.by/images/file/51742827162.pdfIn PDF document text
    • http://vrajacreation.com/uploaded_files/userfiles/files/rugefuxofezidukukereteger.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/9554286212.pdfIn PDF document text
    • http://hondatayho.top/img-ngocbao/files/widufukidudonosat.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/m20u7j8b0i4ji4mvrnnk7o1oqf/zikirasapava.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/zotigawetegawiwavetowek.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/kikaxixurulazefeluwilabo.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/68342968553.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/64f28eae9fe3fbe6c143d40a3877ab87/gitojifogepotazaxo.pdfIn PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/pajukerukemaraxuku.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/57327107088.pdfIn PDF document text
    • http://apnm.indexint.net/ckfinder/userfiles/files/57890013396.pdfIn PDF document text
    • http://qdjshg.com/files/file/mapoxaxesujap.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/watiwevotof.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/mumoneturukokezexen.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/sinaposexunevakuwaj.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/33131882330.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/73528587071.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/56360709737.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=game+android+attack+on+titanPDF 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_off0000da99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA99 17332 bytes
SHA-256: 77607d13d43a9f0ff07974fa1e6a2907da5989599e4740e349830d70ef1b87bc
font_01_sfnt_off000107a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBA 10448 bytes
SHA-256: 7de35894b1f5aca73f44d48e0240be29932566b49e1ae7a75633aed48b648d95

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