Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee30f8ea2f3fbdfa…

MALICIOUS

PDF

37.1 KB Created: 2020-04-02 05:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 19d4ca56fbb22055f9aa776670d91fa5 SHA-1: 98c443c4f081f303902bedb7c56137d9cbb1082c SHA-256: ee30f8ea2f3fbdfa2e4e28ac0397c13baf93cda33c0eef71419ad5b6549bb3ed
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, many of which point to other PDFs with numeric or book-related slugs, indicating a link farm or SEO spam tactic. The ML classifier strongly flagged this PDF as malicious. The embedded URLs suggest a redirection chain, likely to deliver further malicious content or to generate ad revenue. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://online-marketing-experten.net/uploads/1/3/0/6/130620889/130620889.html#sql+server+2012+express+maximum+memory
    • http://litbandit.com/uploads/1/3/0/7/130776056/3035589.pdf
    • http://sketchygoichie.com/uploads/1/3/0/5/130541271/b7d898.pdf
    • http://verityrecycling.com/uploads/1/3/0/8/130874064/1363432.pdf
    • http://mortenlund.dk/uploads/1/3/0/9/130969934/tipoxuvodebetokuv.pdf
    • http://theskincaresiren.com/uploads/1/3/0/4/130477775/nujumitatof_sefalokerefel_rerixajunasima_xotogesu.pdf
    • http://dickersoneyecare.net/uploads/1/3/0/6/130639903/fexakuvuzada.pdf
    • http://mcclaskielawnservicellc.net/uploads/1/3/0/8/130814513/a5cdb21.pdf
    • http://retrostars.shop/uploads/1/3/0/4/130490719/74c62fdcaf3e9.pdf
    • http://hostmaster.restaurantdelys.be/uploads/1/3/1/4/131413222/lenave.pdf
    • http://svsm.nl/uploads/1/3/1/4/131407890/linuxuremiro-wunuvobapafiru.pdf
    • http://guarantorfinder.com/uploads/1/3/0/5/130547150/1483280.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064fb.bin
4d49516f3bb9c6b4958829272284835bf66f4a3eb8628c5e0322f8a773143270		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64FB 8620 bytes

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