Malicious PDF — malware analysis report

Static analysis result for SHA-256 c665fe7b8f6114fc…

MALICIOUS

PDF

71.1 KB Created: 2021-10-02 23:57:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: eb5c9edf23a0455e8f04a7c42c106a93 SHA-1: 1134d05feb8c3de58a67c4ba34b3eee1048e1040 SHA-256: c665fe7b8f6114fca690a5d99cfa51575e872bd28a41f7ba2c4efdd7bebdede7
66 Risk Score

Malware Insights

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

The sample is a PDF document that contains a large number of embedded URLs, many of which point to disposable hosting. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the PDF structure and numerous external links suggest an intent to redirect users to potentially malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 4

  • 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.
  • 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://crysiq.ru/uplcv?utm_term=use+two+points+to+write+an+equation+for+the+function PDF link annotation
    • http://www.flamanville-76.fr/upload/file/demujiwup.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/80385773497.pdfIn PDF document text
    • https://innotek.vn/uploads/news_file/zelimetiguronifav.pdfIn PDF document text
    • http://hmondo.com/userData/board/file/99129697986.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/jaliroxikokibux.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/37792520775.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42772981043.pdfIn PDF document text
    • http://15881588.com/ckupload/files/53665357940.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/tazevake.pdfIn PDF document text
    • https://fivetc.net/uploads/files/nadapu.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/nodawotubeberilopeteful.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/neluseboluregadefunezuv.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/64648037855.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/93c3cd804b9e739e7d9581a4ffac2329/22931727424.pdfIn PDF document text
    • https://actor-conseil.com/files/file/86045162963.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/zewosupotafitowegobi.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16150906b56a2f---84929884806.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/motopatunizema.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/gagusajiwumin.pdfIn PDF document text
    • https://izometal.net/mm/file/37559851256.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/jedubesalanuxu.pdfIn PDF document text
    • https://gogreenonline.net/userfiles/image/fckeditor/file/44578760004.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_off0000af9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF9E 10872 bytes
SHA-256: 478d03b6c6bde4c9cfe246519eaddc3f633799db7ab514bbffe56f8a3a646ac8
font_01_sfnt_off0000c8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C7 17624 bytes
SHA-256: 5e0341dcfbcd0fffce60e6408a221917bed1b60113f390533051113010412b59
font_02_sfnt_off0000f6b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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