Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f3e3b40fb99b04f…

MALICIOUS

PDF

31.3 KB Created: 2020-05-11 01:01:06 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 9f8486a7eb5df84a15b3fcfb1cf6ae34 SHA-1: 918635b0d2518fc541857abbc41addda2ee9c89a SHA-256: 3f3e3b40fb99b04fef27de7328c500ca4cd927b7f50b69feabfb6a65f37d6e0a
70 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF file contains a link farm with multiple PDF files hosted on various domains, disguised as educational worksheets. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting a lure to download potentially malicious content. The presence of a 'SE_DOWNLOAD_BUTTON' heuristic further supports the idea that the document is designed to trick users into clicking links and downloading files.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://crs-cmp.com/uploads/1/3/0/7/130739446/130739446.html#euclidean+geometry+grade+10+worksheets
    • http://oakcitymodern.com/uploads/1/3/0/9/130969571/e6a42a774f9.pdf
    • http://skmmglobal.us/uploads/1/3/0/6/130639632/gobiletuw.pdf
    • http://mjheating.com/uploads/1/3/1/3/131382395/661257.pdf
    • http://mikescottthomson.com/uploads/1/3/1/4/131454440/5cb850.pdf
    • http://sempertigris.com/uploads/1/3/1/3/131382141/pogibit-rukezadef-betumija.pdf
    • http://osiria.online/uploads/1/3/1/4/131406118/xaxivuwokavivagomila.pdf
    • http://yournextbeer.ca/uploads/1/3/1/6/131606505/8bf7f1.pdf
    • http://charlesjohnstonconsulting.com/uploads/1/3/1/3/131381693/buribakekovuvozo.pdf
    • http://robeycreekbeagles.com/uploads/1/3/0/7/130775518/nogovofisosir-vafedu.pdf
    • http://annmicheleart.com/uploads/1/3/0/6/130604939/sosilofe_xodoxanal.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • 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_off000050ba.bin
33485abed8706ee569dcf88b2447c3d17c86ba097a314b36955cbefe59de7642		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50BA 10260 bytes

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