Malicious PDF — malware analysis report

Static analysis result for SHA-256 c51d875a076823a7…

MALICIOUS

PDF

84.6 KB Created: 2021-09-15 17:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dc14862a3d9e2f1d94602e6cea096d9f SHA-1: f0e90e4b757f89f622cf3661bf4a669a357ea11b SHA-256: c51d875a076823a75aa95e835478ee2765120fd0e0133fcb287bde6ab704be9e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm structure, suggesting a campaign to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bjsddesign.com/filespath/files/20210905133303.pdf In PDF document text
    • http://mislenyiallatorvos.hu/userfiles/file/12906370215.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/e5ea31c2ff83b2e90fffb0da318361ba/76402689804.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/68926406235.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/deneraxujisudegis.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/davumonuw.pdfIn PDF document text
    • http://www.poliklinika-hb.cz/userfiles/file/24180306104.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/21426042015.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/11577652567.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/filenepodano.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/texoji.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/77920539424.pdfIn PDF document text
    • http://malifer.hu/upload/file/matax.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77198036367.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/jenijukunibi.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/4030307233.pdfIn PDF document text
    • http://ranfeng.com/userfiles/file/2021-9///2021991310336588.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/xiwilaxumudidu.pdfIn PDF document text
    • https://webrekruit.com/php_codes/Scott/VieauAssociates/code/userfiles/file/69724137817.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/161411f2d1726c---tifikeliwutedego.pdfIn PDF document text
    • https://familienbilstrup.dk/ckfinder/userfiles/files/84719962237.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/27987060691.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=best+android+browser+privacyPDF 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_off0000e54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54A 10920 bytes
SHA-256: 5fbc36a94ba96253b8623c6a700f86cee7cb1cca26021587f810997b30435414
font_01_sfnt_off0000fe9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B1 17792 bytes
SHA-256: c3565678370e42182eba4c63501f758e98af217c45acba2cf1d00f592605a0fe

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