Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e64a4c75866c11e…

MALICIOUS

PDF

73.9 KB Created: 2021-09-22 17:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 28f91aba82a948eb382691a3788785eb SHA-1: 67c04f3a0769ee7c27de12869b94759b6126f4b7 SHA-256: 8e64a4c75866c11e56ddeca8fd53c15cd59e52ed028dfab4f99a05e42635d7b6
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script likely facilitates the redirection to a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the presence of numerous external URLs. The ClamAV detection further confirms its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4750

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://shiinamotors.com/js/upload/files/90206439082.pdf In PDF document text
    • https://mediaget.ru/userfiles/files/xamolelikebewikofe.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/60274962678.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/28262142930.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/26581925097.pdfIn PDF document text
    • https://speculatio.in/userfiles/file/tejawizivetirerefeb.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/39097671652.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142c7ef8d907---18453445469.pdfIn PDF document text
    • http://momsystem.ru/public/file/lefamotijuvibaxi.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/48243320426.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/12641506423.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/kaperizowubebokexuj.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/gedajegeli.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/12312456165.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/57493773018.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/87004666161.pdfIn PDF document text
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/92896278864.pdfIn PDF document text
    • http://client.diffuse.info/files/16838176383.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210902055546.pdfIn PDF document text
    • https://printsolutions.printsolutions.bg/uploads/wysiwyg/files/61903217972.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/46257265790.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/69360306584.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/23970586904.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=delete+preinstalled+apps+androidPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E3 17552 bytes
SHA-256: bd7e98626afa13d8a62053038023a875cbf0195da65ae7b25bc53f37409c10a1

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