Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8c3f52b6ad8a51a…

MALICIOUS

PDF

67.2 KB Created: 2021-09-26 00:14:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a8db4e828c4c8d4c1ae33b664c69ed0d SHA-1: 0738fbd7f0408e9ada3118fb633127c94395655e SHA-256: c8c3f52b6ad8a51a5c0d87434fce2f2f05d8995eff68c75ded94418bc77e6339
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 URIs pointing to various domains, suggesting a link farm designed to redirect users to potentially harmful sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ketchas.ru/uplcv?utm_term=new+features+miui+12 PDF link annotation
    • http://nguoigiupviec99.com/webroot/img/files/fimoroloruzi.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210902202214_pre4ae.pdfIn PDF document text
    • https://camelcarpet.org/d/files/19112880776.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/rajuredavegagenaka.pdfIn PDF document text
    • https://wroclaw-effatha.pl/grafiki/file/sigemepolopow.pdfIn PDF document text
    • http://leton.pl/userfiles/file/29288123577.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/84864016106.pdfIn PDF document text
    • http://ginkgokatsudb.com/uploads/files/kuvagakijixugoji.pdfIn PDF document text
    • http://seamacros.com/upload/file/78102040631.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/kenibiwimupudomafew.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/67933541431.pdfIn PDF document text
    • https://ijieet.org/ckfinder/userfiles/files/dibegawelinibinog.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9e5302941---busubisemoxuroxuzerar.pdfIn PDF document text
    • http://ativn.com/upload/file/wilobalunoba.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/49368818655.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/9b3cc4f32d63c54cc62ae0c9dcafe29e/sinop.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/ropodukumajaguzunologaxug.pdfIn PDF document text
    • https://sananselmo.com/wysiwygfiles/file/vepudozaliv.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/minovimiboza.pdfIn PDF document text
    • https://praktijkbinnenstad.nl/file/norezijerobipas.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/pafibaxosuta.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_off0000ab59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC36B 14504 bytes
SHA-256: 6c7dbb12cf48e96489b4957adcefee028caa70b198bdd59f89b370072cf19229
font_02_sfnt_off0000e7f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F0 10440 bytes
SHA-256: 656645444add206c1badd7ddd0bea31a1e4987a85edbb9297559fa886cfcd218

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