Malicious PDF — malware analysis report

Static analysis result for SHA-256 75cdc69f73a66cc3…

MALICIOUS

PDF

79.1 KB Created: 2021-09-08 13:08:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 725b613e562778bd2f1d8b7a6a39d32e SHA-1: a510d6a33312f72e19b660e6c49f3518e6a5fdaa SHA-256: 75cdc69f73a66cc3ae0b11b1c45d59698c73d02f6ccb3afccd9a8940b3b35c1e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF acts as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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=present+simple+verbs+worksheets PDF link annotation
    • https://wineart.online/userfiles/file/zenatemuvamodimewogapajen.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/54886762421.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/55425947563.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/rotodozakidesa.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/jedabigixebirazobebi.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/zemewosopenuw.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/16385960859.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/13488970644.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/37796240558.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/21063438272.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/8184260602.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/kujukopumitobufexan.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/8679407133.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/tukafetopenisigo.pdfIn PDF document text
    • https://topupdana.com/contents/files/21585873321.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/wedobopedulu.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f254c4bba0---71505461118.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/23995745531.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/bodejesemejexexe.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/34477796277.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/p13i3sn7vudbn5n3vrri0i1qg4/6555210316.pdfIn PDF document text
    • https://pepsima.biz/files/file/83489376127.pdfIn PDF document text
    • http://rideco.hu/upload/file/59298590338.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_off0000cfc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DC 10740 bytes
SHA-256: 380b83ca1d6dd7aa2994e22778fb1f8dfa0bd75c47fce2e5eb7713a06ce69a85
font_02_sfnt_off0001002a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002A 18076 bytes
SHA-256: 064c2280b84e23924a0d459735ee6167a439de0656e88d82b032f1928483c743