Malicious PDF — malware analysis report

Static analysis result for SHA-256 f78f3574d44780c9…

MALICIOUS

PDF

83.1 KB Created: 2021-09-08 18:58:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9bc660368df98bfafb85a4a560f634e4 SHA-1: e95f9917906239c39f8d84d1df12e46694df5d9d SHA-256: f78f3574d44780c9eb4a8be32bf33cfb9e46d9e402413bb2aab429fd030995df
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://hstechno.com/userData/ebizro_board/file/naxunofagalize.pdf In PDF document text
    • https://sambelteri.com/contents/files/89086991510.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/ridanelogosi.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/mefuraw.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/9592449832.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/41831576138.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/23743013809.pdfIn PDF document text
    • http://omni-links.com/images/blog/file/30842054551.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/67196033598.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/18286743990.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/33473462397.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/82312474363.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/37131574682.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/xudamibilemuni.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/3400899360.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/tadawasiti.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16132cf255b824---pupukodefutowi.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/muvos.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/powupinutug.pdfIn PDF document text
    • https://clove7.com/userfiles/file/lakun.pdfIn PDF document text
    • http://giaydantuongphongkhach.net/images/news/file/nijalajeganamiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=basic+workout+plan+pdfPDF 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_off0000e035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE035 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84C 10812 bytes
SHA-256: 36f778408dc9b8a70473f3ca4acbbbe8c66fded5a5b06bcb0cc5be45ab95d9e1
font_02_sfnt_off00011173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11173 17668 bytes
SHA-256: 038a00576139395d35284e74135316e7c63661365eb1de915794b1b1ff2bfdbc