Malicious PDF — malware analysis report

Static analysis result for SHA-256 d57b2cd42124ef1b…

MALICIOUS

PDF

71.5 KB Created: 2021-10-02 17:05:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 553492325973819ec9836133629d35b8 SHA-1: 62f7c7bd4e2a198f86896068b8ee80ae5f188b0b SHA-256: d57b2cd42124ef1bcc40cbc021d9bdd7011cf577ef67a0a7e79ec62b9c7df5a8
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains, strongly suggests a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://inwebjor.ru/uplcv?utm_term=pilea+peperomioides+repotting PDF link annotation
    • http://kme-kme.cz/files/file/fenilosizimizodima.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/tijetewivenororawepiw.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/7134505886138b98457b0e.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/zepoji.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/62470417893.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/vurorisol.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/xazazenumawawizikulita.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/21545676289.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109070912481502.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/28433683116.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/60487774725.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/73919005891.pdfIn PDF document text
    • http://omni-links.com/images/blog/file/63602985487.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/83024802260.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/d24ec80a9d10bf4a60a14354ac59fccd/mojutudulusunesilejemugu.pdfIn PDF document text
    • http://underbutter.cz/download/foto/zijogilimiw.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202110010702134721.pdfIn PDF document text
    • https://kultmotor.hu/images/files/87557558516.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/morarokogozupilida.pdfIn PDF document text
    • http://agppi99.pretty-match.com/upload/files/57012101919.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/pepuji.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/38470554240.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/11764099906.pdfIn PDF document text
    • https://rafautama.com/uploads/file/46333803084.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/51734575061.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_off0000b537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB537 10736 bytes
SHA-256: c33ccd43384a894903c0be3e16ff8ab7731fde8d89d8f7da55f216b9d128c982
font_01_sfnt_off0000cda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B8 16584 bytes
SHA-256: 14d328f2d5d20a95fd40dd8b57bf3d023f8aa5cda09a765b8ecfc8538b589c43

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