Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dc9a231bcd0ae11…

MALICIOUS

PDF

70.5 KB Created: 2021-10-06 06:09:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 41d406502114c4057e4da1ead8d733da SHA-1: 8bbe818c31249aafa1ed3142a11f4d1b9e48bf2f SHA-256: 0dc9a231bcd0ae11b0d07896ef564bc0d6a309bead81c42478afd0ece9a577bb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nomylo.ru/uplcv?utm_term=data+structures+and+algorithms+pdf+notes PDF link annotation
    • http://gelinyuanyi.com/upload_fck/file/2021-9-20/20210920055211143097.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210909_083049.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/87887213964.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/58820130736.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/36550033680.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/xavigotakojojevatal.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/96346143584.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/motadodutuzenurolapop.pdfIn PDF document text
    • https://istanajp.net/contents/files/tidatenal.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/70278690593.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/99473925757.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/29295784231.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/tawuvukipitoluwadulipiko.pdfIn PDF document text
    • http://fjsxsx558.com/upload/files/84344319561.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/dutemimozumu.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/13496098777.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615cfd2cc533b---55062467079.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/90091186321.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/81595885166.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/8382320938.pdfIn PDF document text
    • http://watch62.ru/files/files/lubijokiru.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_off0000b40d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB40D 11168 bytes
SHA-256: 6765478776d7e7c91a5e91e901f2be7c288c831cee58fa6cc88d51a79ad0d36d
font_01_sfnt_off0000cdba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBA 15564 bytes
SHA-256: 938854d035647ad1df61f950f8ccc02e42fd7a8ffe383e12ccfb36cb9f91a93b
font_02_sfnt_off0000f485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF485 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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