Malicious PDF — malware analysis report

Static analysis result for SHA-256 e990c73ef878b8c5…

MALICIOUS

PDF

68.4 KB Created: 2021-10-02 22:31:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d1e6b9abfe270f38fffe2740c9036c3e SHA-1: c3850fdbb60a80464d49f72e7e8751595466abe2 SHA-256: e990c73ef878b8c528ee39b7e9abc765077ac80ee63a4ddaf4cd93cedc9457ef
134 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and external URIs. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a link farm, and the presence of embedded JS points to a likely redirection mechanism. This indicates the PDF is designed to lure users to malicious sites, potentially for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://bananamusic.tw/uploads/files/202109260829531571.pdf In PDF document text
    • http://porpora.group/imagenes/imagenes_contenidos///polafuxokovopikitu.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322fbf516a4---50931364112.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/3120993413.pdfIn PDF document text
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/vowalaxin.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/repidisilixojilenok.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/93066746373.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/50397557397.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/11953335868.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/niworijifozewopubuvebife.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/33850299658.pdfIn PDF document text
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/fakarikivininosesagamuf.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/51f2fe703701a71ca6ac107bc5ec6178/59656889093.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/9916920353.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/202192321862580.pdfIn PDF document text
    • https://sainaudit.mn/File/vovagujoni.pdfIn PDF document text
    • http://internet-trade.eu/UserFiles/file/10258248465.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/jetewijito.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/tuwawem.pdfIn PDF document text
    • https://benmoonpharma.com/userfiles/file/zojuxisa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=walk+on+clouds+idiom+meaningPDF link annotation
    • 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_off0000ab76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB76 16044 bytes
SHA-256: df2323cbf787e78574d83275f44a5190ed108d8be81af552ba167d3376dd34ed
font_01_sfnt_off0000d411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD411 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC28 10700 bytes
SHA-256: a47b94936b83eb6451216621eb101aef9abd99b4c45af0f18d3eff7191d5c0ea

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