Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b93f7e85ba3b7d4…

MALICIOUS

PDF

80.9 KB Created: 2021-09-23 11:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8d560e470a1c92a166893fbc24393903 SHA-1: d18fbf6656975ef865e37cb66379e59899d7a487 SHA-256: 6b93f7e85ba3b7d43fdf8012a71b25ebc07433310dfcee0b1bc8edef152d0eac
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to potentially malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host many links on disposable domains, likely for SEO manipulation or to obscure malicious destinations. The ML classifier strongly flags this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://siamsankyo.com/Uploads/file/32770013190.pdf In PDF document text
    • http://hai-bi.com/uploads/files/202109010714391095.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/79789328544.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/bulafuz.pdfIn PDF document text
    • https://swiz.eu/files/editor/jufesupixot.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/75739454203.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/97010335023.pdfIn PDF document text
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/3040805338.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/wusuxikifiwuparofojanatu.pdfIn PDF document text
    • https://xn--q3cceuw0c6ab0d2ii.com/upload_file/files/90138084027.pdfIn PDF document text
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/daxegepelorobadavewobabi.pdfIn PDF document text
    • https://medbioplast.com/klucharnet/images/file/zotuvo.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/28763606346.pdfIn PDF document text
    • http://xn--or3bo5mvlb.com/data/editor/file/9769462439.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/34811395468.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/31596314453.pdfIn PDF document text
    • http://avvolodin.ru/upload/file/fimarapazivojazagi.pdfIn PDF document text
    • http://stamforgtechnologies.com/uploads/warufijumoleso.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/14658079041.pdfIn PDF document text
    • http://almavilag.hu/files/files/fikirenixalejudun.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210903100122.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143e85f5bb74---biromizarosonetebopes.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161334ace448a2---51597995415.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=emotional+intelligence+assessment+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_off0000d5dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DD 18116 bytes
SHA-256: 39d73e30b95046ff4a123972d8e670bbca471c09d1db309dd4db4cc095d26c15
font_01_sfnt_off000104ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FF 10844 bytes
SHA-256: 8509b0dbd9f02baf836afd31436359999f7aa0bcae0b54825e1e9eff0e3363d7
font_02_sfnt_off00011dca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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