Malicious PDF — malware analysis report

Static analysis result for SHA-256 6339896a2ca5ded0…

MALICIOUS

PDF

82.4 KB Created: 2021-09-23 00:25:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 14dc11b674a0dacf39b71cd07df547a5 SHA-1: d2963d187003beac7055719a566d4ac5f6a014f0 SHA-256: 6339896a2ca5ded0c090380077bd676aac209375854af334132550fe89bc4ec6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous unknown URLs suggest a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • 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
  • 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://stavo-bazar.cz/userfiles/file/6357619453.pdf In PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/xifidarulosibi.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/pejetexozu.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/kepudupa.pdfIn PDF document text
    • http://nemochem.cn/upload/files/sutajimejorotegodek.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/43172921438.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/46117213539.pdfIn PDF document text
    • https://sibirprokat.ru/ckfinder/userfiles/files/nowozuba.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/15170941651.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/46432625963.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/nirudiwif.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/remebema.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/36020583932.pdfIn PDF document text
    • http://wwstationery.com/files/file/22825878260.pdfIn PDF document text
    • http://lmtechsolution.com/userfiles/suziz.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/2040098797.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/33512623424.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/koxixurujar.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/97672818649.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/xepapefotisawojof.pdfIn PDF document text
    • http://ggbris.com/slbdavbatala/userfiles/file/68796144943.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/30387236110.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/simajujunotezatutikidiki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=dragon+ball+z+shin+budokai+download+for+androidPDF 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_off0000d947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD947 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF159 19140 bytes
SHA-256: 76a9b67c9eb75b8215951f50bf1e971dcbb9277101b4c0564ac35f079076f343
font_02_sfnt_off000122eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122EB 10880 bytes
SHA-256: a336d7245b0a412bf24d0d1fea412549dd2bed36e108a57e4f48343c23913b48

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