Malicious PDF — malware analysis report

Static analysis result for SHA-256 94b50d46cc932d61…

MALICIOUS

PDF

77.0 KB Created: 2021-09-11 03:15:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 54aa91cca522092f0d644fffe27ad8c1 SHA-1: 4cf593473f616a9a7d070081410fe2912dcef694 SHA-256: 94b50d46cc932d615a22f04371e69b68dacd4114758f9ab26a9c1fac7ffe1d99
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://ph-easycome.com/userfiles/file/favinor.pdf In PDF document text
    • https://electroagro.es/pub/files/lojejakozad.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-9-4/20210904210417582542.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d6bf6ccb0---jodapapenapotejideg.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/lolunimamaroxo.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/85792683018.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/62389755816.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ae4fc0ee6---zukaz.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/rilesumovefabuwadetadif.pdfIn PDF document text
    • http://eksternest.be/images/file/11115067381.pdfIn PDF document text
    • https://satesayap.com/contents/files/27331638488.pdfIn PDF document text
    • http://china-miyaco.com/img/file/2021939222.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/97610438217.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/fizoxegomotejif.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/30090465933.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/70335377527.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/fumuzipewamoduxotatofisu.pdfIn PDF document text
    • https://fu-ko-property-agency.com/webroot/editor-uploads/files/34944206030.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/muwulirol.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/29114174305.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/xofasazimixukakumuzesod.pdfIn PDF document text
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/94306582728.pdfIn PDF document text
    • http://www.centralperdana.com/file/pafufuxagijafisab.pdfIn PDF document text
    • http://thongthien.vn/upload/files/mukubopedaropakalenedum.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/zoxawidodekanokowitat.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/50258567310.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=kiyosaki+fake+pdfPDF 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_off0000c84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC84B 18480 bytes
SHA-256: 62a9b8247cde4c97fd02a0714d3d5e73b406ce564a238d4fccf177ee309d1c0a
font_01_sfnt_off0000f6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF7 10340 bytes
SHA-256: 72cd120f10be644db40859896f2ad1edad7e902aa613397f252f6f9f8ba850dd