Malicious PDF — malware analysis report

Static analysis result for SHA-256 f919d04fd2ed630b…

MALICIOUS

PDF

79.3 KB Created: 2021-09-16 05:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 701edbb9fc2a071d056581ca47aa1373 SHA-1: aca9ac4e7c8002a5df4bc68210149f122526d660 SHA-256: f919d04fd2ed630b98e9eb11cc4ff57b7ff1bd1f27fb03ff70501b7071441808
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many hosted on disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to redirect users to potentially harmful content. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 5

  • 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://coretry.ru/uplcv?utm_term=vue+js+books+pdf PDF link annotation
    • http://wwsm-hk.com/files/file/5546643217.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/70270814173.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/de93df389e1d60eba8b2ef465d94162a/pimaxudejugilidorip.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/femefowedobum.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/60722140982.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/zobutelinovamuzad.pdfIn PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/guwetivaw.pdfIn PDF document text
    • https://denimder.org/resimler/files/78203188026.pdfIn PDF document text
    • https://atrax.hr/files/sotopara.pdfIn PDF document text
    • http://proxima-design.cz/files/file/gipifoxamugepudil.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/depetapojapipewif.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/gidavodezizaruji.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/mojopimejeza.pdfIn PDF document text
    • http://salt17.com/userfiles/files/99623209115.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/regavi.pdfIn PDF document text
    • https://projetovm.com/uploads/files/95408265638.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/72936216359.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/31537098090.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/82508525590.pdfIn PDF document text
    • http://furniture83.com/upload/files/vijunapowumisukes.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/xefemebubonaxowiwo.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/masepexizunodupupis.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/52235905150.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_off0000d489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD489 10320 bytes
SHA-256: 751f263a4ad2906ac79bbf8a29869f47cc36c7cf35b038d96a0ff4c5a1ef0e15
font_01_sfnt_off0000ebc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D4 17260 bytes
SHA-256: 345607264725f081e5908eb583baa80bc7a4f577a0b7210590472e258760ad38

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