Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d3fee66ba22731b…

MALICIOUS

PDF

80.9 KB Created: 2021-09-19 07:18:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c92e7f20c37ac965605362149ac264d8 SHA-1: 02a295ce17f3d881fa18c029277cd65d791ac9c2 SHA-256: 4d3fee66ba22731bca82fb1055ffff51882af995bcb0ea699b049b5d1352a473
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many pointing to suspicious domains, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://dtd.com.pk/ckfinder/userfiles/files/22427493207.pdf In PDF document text
    • http://happyhanool.com/ckupload/files/11736701927.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613638550b737---pawuxomamulivawajuxan.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/92577515396.pdfIn PDF document text
    • http://icoenergia.com/userfiles/files/62898336074.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/70237793365.pdfIn PDF document text
    • http://btfa.tw/upload/files/88911080584.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/70597232408.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/92661108760.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109150647049788.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/bufoluvigisis.pdfIn PDF document text
    • http://unseretochter.com/images/file/tofevifafepinoforol.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/91839564457.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a0213bc72---65196431550.pdfIn PDF document text
    • http://vagyonvedelemszolnok.hu/admin/fck_upload/file/govawotejorom.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/dunipewexitesuzoga.pdfIn PDF document text
    • https://alutat.com/data/file/74813122017.pdfIn PDF document text
    • http://synphabase.ch/upload/file/pijasijumofaxuj.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/xevutab.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/tujuvakotuzofavip.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/25954930751.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/36343364914.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+know+your+wifi+password+in+androidPDF 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_off0000d75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75F 10696 bytes
SHA-256: 270447c48021b03f6adcd393d19de199a762a800e4c5ac95c5fc74c3239ab741
font_01_sfnt_off0000f012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF012 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10824 17864 bytes
SHA-256: eb496bcaa235309a66d5d344fd77dc0028800c3acf9202f87a3a4d916eea5d18

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