Malicious PDF — malware analysis report

Static analysis result for SHA-256 f55ac12851da7e63…

MALICIOUS

PDF

83.0 KB Created: 2021-09-17 12:48:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 06a3e46f1bee7712a56d4bbbb1858a62 SHA-1: 84311fdb93d86debccc161bcda3fd40d9d050115 SHA-256: f55ac12851da7e63ef3320f1f966514fb025301126802bb5238d9b929fd4cbe4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, including a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The primary function appears to be luring victims through these links, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://coretry.ru/uplcv?utm_term=sprint+htc+evo+update PDF link annotation
    • http://ng-sons.com/userfiles/file/83747989715.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/0b7e52372168eccc6a811c21d7d6d354/30084163455.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/53671689126.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/71299454912.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/rilisep.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/nepifojazin.pdfIn PDF document text
    • http://nincity.de/inline/file/18677278876.pdfIn PDF document text
    • https://krusomying.com/data/file/2474822154.pdfIn PDF document text
    • https://vientangluc.com/upload/files/6070659289.pdfIn PDF document text
    • http://minhnguyenvn.com/uploads/userfiles/file/rojaz.pdfIn PDF document text
    • http://videocycling.info/files/file/maveketubebejigumosiwaj.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/41478558925.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/41206469187.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143aefee6f80---litopuzexagusajak.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/17622480886.pdfIn PDF document text
    • https://acmfashion.vn/uploads/files/89474135890.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/xomera.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/lexepexukiwilibi.pdfIn PDF document text
    • https://producto.works/userfiles/file/foginajoledur.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/48749094696.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/kafuluruxuzu.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/98106811465.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/ximof.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/dibusur.pdfIn PDF document text
    • 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_off0000e0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B6 10640 bytes
SHA-256: 4e130e5e894e84e33942918f28309f33bda7dc67c58fafbd437ac4e58bf86248
font_01_sfnt_off0000f8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FF 17528 bytes
SHA-256: 6a4a11dff04dd317d92c83a7420d11b7fe5ea4c5d7b9baed8fe1e604c4d1d926
font_02_sfnt_off00012640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12640 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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