Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d70f08bead4aebb…

MALICIOUS

PDF

76.3 KB Created: 2021-09-09 14:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1fe0dfe865a94994bebd45bd2704f1a0 SHA-1: c4d188bd0bcb9ea7e02bd3e7cb439aa91a08b420 SHA-256: 9d70f08bead4aebbd68c7a19d0bc5a7954f7ffb7554b1a4ace301f5aa4de5742
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 numerous embedded URLs, suggesting it functions as a link farm or redirection mechanism. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to obscure the true malicious destinations by using many distinct, disposable hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=gb+whatsapp+app+apk+download PDF link annotation
    • https://hahapediatric.com/uploads/files/202109090301156413.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/24594299772.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/24677468445.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/66125133083.pdfIn PDF document text
    • https://pecsikult.hu/files/file/wanos.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/38136594739.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/mogiwabubexobi.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/18735020300.pdfIn PDF document text
    • https://alwaysthesame.pt/site/upload/file/fubukudukada.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/kifivuvexemevo.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/98374448594.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/vowuji.pdfIn PDF document text
    • http://vidiniaibreketai.lt/userfiles/file/55459552402.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/73309375490.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/robobuzenada.pdfIn PDF document text
    • http://lse.hu/userfiles/file/84211278826.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/3991734525.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/27471367166.pdfIn PDF document text
    • http://etkenkalip.com/files/54504961206.pdfIn PDF document text
    • http://rajasthanmetals.com/userfiles/file/95030523929.pdfIn PDF document text
    • http://www.77ice.com/upload/files/golufusejajiganamij.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/redegekalinizimojuramew.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/161325953d600b---nolasifuwok.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/vubuvidogufap.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/daseze.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_off0000c4a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A4 18308 bytes
SHA-256: f6df758078e70282c291fc82379aa3cc8daeb258f8a548a3641148d46ce76d4f
font_01_sfnt_off0000f3c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDB 10520 bytes
SHA-256: be3fdd58f2b140787f8295320af1b1f8c08a69c73e930f421da94aba6012aa0b

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