Malicious PDF — malware analysis report

Static analysis result for SHA-256 313779f30015da0c…

MALICIOUS

PDF

80.1 KB Created: 2021-09-11 14:32:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 2a0bb3ade15fba455bdf1cbe3a7a7762 SHA-1: eb62e308d2750acf5b4eaa5175f66137128ee0b0 SHA-256: 313779f30015da0c57f4b92aa9993020acf3327fa2b832faabd7fb84f910cdf1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • 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=best+hacking+app+for+online+games+without+root PDF link annotation
    • http://laskod.hu/userfiles/file/73263673739.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/tijidosesapukadilipuwo.pdfIn PDF document text
    • http://hyundainhapkhau.net/upload/files/repugurevovawepuwidakenu.pdfIn PDF document text
    • https://www.netcorp.hu/data/editorfile/57991758539.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613a678330f96---99875112467.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/bojifuberak.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/files/zozotuwisadonenemajij.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/32541605657.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/22356891804.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/fukedusuwitupikakojem.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/20717024592.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///18685333993.pdfIn PDF document text
    • http://e5tbr.alruaa.com/ckeditor-ckfinder-integration/uploads/files/20008816198.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/k62fnh9pf1qkqsfltk0rdrjtn0/fiditolopuguzuwitukofidiw.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/35599679186.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/47108050057.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/27225430030.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/30691738063.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/82512515659.pdfIn PDF document text
    • http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/kikupoxamajoxediparo.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/keziruxaxana.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_off0000d181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD181 11256 bytes
SHA-256: efc69e1d533e90aff815208e0e9327088f87310621b63c188e9275b773a35147
font_01_sfnt_off0000ebda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDA 17956 bytes
SHA-256: 1d7b2f9878428e748718344f72d03ebf82f03d032f00f32d1cca3537f7a2647e
font_02_sfnt_off00011acb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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