Malicious PDF — malware analysis report

Static analysis result for SHA-256 98dd0bed97a4432f…

MALICIOUS

PDF

87.4 KB Created: 2021-09-18 00:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 88ce6e8b9b0f7453625d9373abcabb01 SHA-1: 6c7f9edf9ba097cb4f67695169b02bcd7b6176b9 SHA-256: 98dd0bed97a4432f85d588b046d9215199488223b8bbde56a283d7917e4b8654
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it is designed to redirect users to potentially harmful websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm on disposable hosting, commonly used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://drafthe.ru/uplcv?utm_term=android+ship+games PDF link annotation
    • https://mercerapparelss.com/userfiles/files/79473030878.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89445092755.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/kowerupiloledelapejuxex.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/62428755088.pdfIn PDF document text
    • http://emannsltd.com/userfiles/62332723525.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/93575890275.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/wepulunef.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/jofewi.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/pozejizox.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161390e07caad5---luzujivukawovinagukunagul.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/fepesewosilo.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/fuxaz.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/7308623557.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/41783671129.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/renijumuxikazafuk.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/89361594622.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/xefutixi.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/91749042339.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/1239162174.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/rksu095l1ak157s3f264uil59p/gavojoboxizojavu.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/3786930454.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/80478414552.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/xuwetugiradabekiri.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_off0000f517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF517 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D29 16604 bytes
SHA-256: c72d85dce954f1cd85836181006389dfbf157ac0b9b7940b7ddab36ad2f8fac7
font_02_sfnt_off0001385a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1385A 10676 bytes
SHA-256: f1f06c3fadd3bf4dc442a53a3d307b4914c1249a480ba0dfe9023a3b30210442