Malicious PDF — malware analysis report

Static analysis result for SHA-256 611ebcbcc94d4df6…

MALICIOUS

PDF

97.0 KB Created: 2021-09-17 19:23:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 313630a4605f42efa66e0dc10a53e9c4 SHA-1: 668f83f6a78b063562524751cc436b189b7bd5a5 SHA-256: 611ebcbcc94d4df69397781f7eed8afb74899a2d59cd3e1c50c123929a0c2f51
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which are hosted on disposable domains, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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=the+doors+of+perception+pdf+download PDF link annotation
    • http://podolsk-kondicionery.ru/upload_picture/file/88762574390.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/13a31046f3e7f4484718d1b2adba9a99/95981726577.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/33025159212.pdfIn PDF document text
    • http://hibertek.com/image/files/20210913_225421.pdfIn PDF document text
    • https://fivetc.net/uploads/files/35627796123.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/rixadomesixafugumusepada.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/govuzawa.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/wewadujeranusivunadag.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///23404230610.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/pigumofurevevaranon.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021091202293714.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/butukojababelab.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/nalefoxivuvagopapubekiv.pdfIn PDF document text
    • http://morakothotel.com/file_media/file_image/file/51554669319.pdfIn PDF document text
    • http://kunbot.com/upload/files/61998089359.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/jezopewobibavilima.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/wegag.pdfIn PDF document text
    • https://laatuwhuisweerstralen.nl/upload/file/pivuwededadujelasuje.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/xegevudobanegidapegu.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/mezepajisasamobu.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16132b73438c24---popodasof.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/jekebujumexisomuvazuf.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/94447920648.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_off0001149e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB0 18772 bytes
SHA-256: 5d6d39d99deb926b79c8a5bcb825bc08794000bddc957bdbe8c0a90cb4bec450
font_02_sfnt_off00015d76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D76 10768 bytes
SHA-256: 8d9ec63e6a0a09238ab1535d3c8c2d4d12d4ebc14b8ad05bf61f98542e3165b5

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