Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ec075f340c4e6d5…

MALICIOUS

PDF

85.5 KB Created: 2021-09-16 03:04:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0a7094582fe7860066aaa6de71ea19b8 SHA-1: d8299edb87be3bd4a34a1042b1765e3b4971ef69 SHA-256: 1ec075f340c4e6d5813287fbbd7cd01290e43dcd3edeb23d9adb1646ca64ffd8
134 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as malicious and a ML classifier with high confidence. It contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://komunalno.vrgorac.hr/files/milujifakeko.pdf In PDF document text
    • http://i-dron.cz/data/file/rovotaluzezavigezam.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///zonukojikigozugaxobeso.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/jajemabojalisipojejomugox.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/falabilemadeso.pdfIn PDF document text
    • http://finara-v.com/file_media/file_image/file/66291125923.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/zasova.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/57686739990.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/80270757810.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/3086212657.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/letojejavufademagexa.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/lobezamobog.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/13671304450.pdfIn PDF document text
    • http://iphysiology.ru/upload/babiwopibegogikifulufe.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/wobuxutak.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/rogifetasuz.pdfIn PDF document text
    • https://thepainter.asia/upload/files/87879991469.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/jigokebuxuzesivuvewew.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/fuladabirugizatemofabixor.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e4510f150---88222787481.pdfIn PDF document text
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/pimuwejululelamukinunam.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613169012066e---34165778474.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37885319320.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210901175916.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=simulator+sex+game+apkPDF 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_off0000e767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE767 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7E 10860 bytes
SHA-256: e84e3027b39f7bf98317c4013892feeb6ef83de773553cf61bc6a5b46dfbeb38
font_02_sfnt_off0001189c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189C 18564 bytes
SHA-256: 99d03c16f2aca90baf34a8eb885fff4cdc578a352ae8e6d77d25739f22426fe8