Malicious PDF — malware analysis report

Static analysis result for SHA-256 f81d60ba73a2c57d…

MALICIOUS

PDF

82.1 KB Created: 2021-09-17 15:24:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2006aa5af0fb1788912612e3b8a161d1 SHA-1: fc2a9def796e30bc0f246f728d4ff2f1587cde79 SHA-256: f81d60ba73a2c57d2796f2f92f5f5493176a4bb7a26af135cbbbd6a14045e2ed
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to potentially malicious domains, suggesting a phishing or malware distribution campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that the document is designed to host a large number of links on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://medvor.ru/uplcv?utm_term=irumbu+thirai+full+movie+download PDF link annotation
    • http://showpalmedical.com/userfiles/95599032822.pdfIn PDF document text
    • http://nemochem.cn/upload/files/putugodamibobizizifarino.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/78238944369.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/50087368684.pdfIn PDF document text
    • http://skupka23.ru/upload/m/xodake.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/padisokife.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/jigok.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/xubimezopejelonefiva.pdfIn PDF document text
    • http://thayloilocnuoctaihanoi.net/upload/files/3098847209.pdfIn PDF document text
    • http://esejsc.com/upload/files/59027859357.pdfIn PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/43691588221.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16140911c03c9c---48643201807.pdfIn PDF document text
    • http://www.moyekolodin.com/files/jupofavodawuxal.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/35326406456.pdfIn PDF document text
    • https://tessuno.com/upload/files/614432bb61a6e.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/b91be4d0769d399046b4d236278f7131/61717441699.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/31329184323.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/vonemuvipibadexowamu.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/bolexiradewir.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/gagizowatexanogal.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/725384022.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_off0000dc23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC23 18012 bytes
SHA-256: 76d1d7190639a68fee7f0ec94a2a45f907729e8e4cb3cb1f18e605ca2c6e7578
font_01_sfnt_off00010a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12255 10792 bytes
SHA-256: a569c24a938393e89ca9f14987c7126218b25cd111507773fcee82a92dfb4444

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