Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e53f98e57995c3c…

MALICIOUS

PDF

84.3 KB Created: 2021-09-16 01:26:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3a21a72dae6643a06c53753583296639 SHA-1: ea2f16b6536a19226ce739f247381065c998984c SHA-256: 8e53f98e57995c3c0d0b92e375860dfd9f88b4cbf4b74368c7a7a30d61f9c940
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for malicious documents. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is designed to host numerous links on disposable domains, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://awkontrakt.pl/ckfinder/userfiles/files/teximemakibafarumikajo.pdf In PDF document text
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/jawizid.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/5315105264.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24778494697.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/24c89019c5019bba3fac71d57d6f7d28/gireri.pdfIn PDF document text
    • http://mebizstekla.ru/userfiles/file/lobibibilofitabuv.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/6059398946.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/liviperevuverede.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/ligujoxakedetam.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/jixibedenorizu.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/44313651329.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/rulejedurusaf.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/17641404891.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/19351026949.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/fenuz.pdfIn PDF document text
    • http://kmjmt.com/news/upload/file/2109140910103151251nrete.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/74324827445.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210903054545.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/dasojogupenekuk.pdfIn PDF document text
    • http://rsentco.com/upload/file/tapawu.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60117525119.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/jativulutomufuboguwiguleg.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/74368949942.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=google+atari+breakoutPDF 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_off0000e3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C1 10384 bytes
SHA-256: 1fed2f6cc90c9a6c82c9e9ecbae70aac2b44b648ce53667a1617c8e602b14a9d
font_01_sfnt_off0000fb67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB67 18404 bytes
SHA-256: fec5efaa9a922bca8120b606472fa38862e36ac9be4cffe2a1fac995fd5ceb49
font_02_sfnt_off00012b6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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