Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e868a750f0fff81…

MALICIOUS

PDF

80.1 KB Created: 2021-09-09 01:22:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: dded254acb0b8c7913eb47fa085de2a2 SHA-1: 8dc8329e98eaee34a6ec6f3355967826b8030aa0 SHA-256: 7e868a750f0fff8121e05429b7268490e4ac6d497f32dce2839719191f1f3133
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by 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 0.9981

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://candientu24h.vn/webroot/img/files/rejuresapozetu.pdf In PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/20215093716.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/77152262759.pdfIn PDF document text
    • https://mabuksusu.com/contents/files/89064457204.pdfIn PDF document text
    • http://eldorautomaticgates.com/UserFiles/file/sanogawimafigulelolo.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/wowipoxe.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/pifizuvafikotuse.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/lasavonuvolubew.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/33413523075.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/9761863661.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/gutepovuf.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/78472355653.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613934be5c60b---67432082751.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/sinabovase.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/rinizisitiwoviwawejel.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390a70437f2---lorugerosuku.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210906_9B0C938B1BF33455.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109031920209530.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/26398167789.pdfIn PDF document text
    • https://airin.lv/images/userfiles/file/89424910791.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/28524199832.pdfIn PDF document text
    • http://azizolace.cz/images/file/xebizu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=messenger+not+working+on+my+iphonePDF 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_off0000d64c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64C 10776 bytes
SHA-256: c97c8edd38543eb4e0c09624c29829d42e7b3f40ad7c5f3e479c2f6830331c65
font_01_sfnt_off0000eeff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFF 17092 bytes
SHA-256: 1b691c89dd4c8d0846aeab518b1b045150700b0bb91ef8bd96aaacfa42c3ddb1
font_02_sfnt_off00011a4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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