Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b80320fee4e8a88…

MALICIOUS

PDF

84.5 KB Created: 2021-09-22 10:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c700b20240314b31c4527a1d3f81e2ac SHA-1: 3c9a291c8bb9da34a3009554dfd9da714d593fbe SHA-256: 9b80320fee4e8a8839cafa0d6d1d60986e91689bf7d3c93a076f3e6498eb9ab7
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV with a critical heuristic firing for Pdf.Phishing.Trojan. The PDF contains numerous embedded URLs, with one heuristic specifically flagging it as a link farm on disposable hosting. While the document body is heavily obfuscated, the presence of multiple external URIs suggests an attempt to redirect the user to potentially malicious sites or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3897

Heuristics 4

  • 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
  • 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://cuanhuaabshanquoc.vn/files/51147663231.pdf In PDF document text
    • http://nwatchonline.com/userfiles/file/wigosobidavujez.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/82437112604.pdfIn PDF document text
    • http://innersolutions-uk.com/file/zufozo.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/vujoza.pdfIn PDF document text
    • http://yalcinsezer.com/upload/ckfinder/files/dereve.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/bekadunusuninegoradaf.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210901_090619.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/82481932661.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/jexasubabalajenekejal.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/39377426571.pdfIn PDF document text
    • https://anakaygame.net/calisma2/files/uploads/8481852762.pdfIn PDF document text
    • http://thegoshow.net/userfiles/file/64866423214.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70129611799.pdfIn PDF document text
    • http://maha.tcnme.com/chop/multimedia/userfiles/file/65727582767.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/44585841971.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/54453582954.pdfIn PDF document text
    • https://coil.hk/upload/files/fejixovulojo.pdfIn PDF document text
    • http://leeharringtonhomes.com/userfiles/file/xekevogefumifilavezadeb.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/vefukaxav.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/muimu57hcjvrjmg2umd5l4aggd/pojiniwagotosax.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/vuzizaruso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=install+xapk+firestickPDF link annotation
    • https://mediaget.com/userfiles/files/jubafizotenepusudexefabi.pdfIn 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_off0000f32b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32B 10500 bytes
SHA-256: a18d9c20049e6f2c4f4a20b31643ac4d714fecd2af9e938f33aedd1b294c5e7b
font_01_sfnt_off00010b33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12345 20320 bytes
SHA-256: 0911b101e5aed3e3cb614a76a9d344bac037c521e316655f9e41d59ceec22a4d

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