Malicious PDF — malware analysis report

Static analysis result for SHA-256 731b36d59037ffab…

MALICIOUS

PDF

35.9 KB Created: 2020-05-21 04:40:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3111c9f57996a10b0a2a851052aee666 SHA-1: 8f1fb7faa17fe38b5cb07d8aec28af865688a77f SHA-256: 731b36d59037ffabbb1d88736caee6d38f739a363795c93d81dd747cc93ab035
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document contains a large number of embedded links to external PDF files, a technique often used to obscure malicious content or redirect users to phishing sites. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document likely prompts the user to install a browser extension or update, which is a common social-engineering tactic to facilitate malware installation or credential theft. While no scripts were directly extracted, the ML classifier and the nature of the embedded links suggest a malicious intent to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://tripanmarketing.com/uploads/1/3/1/8/131857782/131857782.html#spectrum+code+ia01
    • http://creatingjoy.net/uploads/1/3/0/5/130544118/8027830.pdf
    • http://zellerlifestyle.com/uploads/1/3/0/7/130775883/8794419.pdf
    • http://chandlerbankownedhomes.com/uploads/1/3/1/4/131454394/624d1cf2.pdf
    • http://bayareasomaticpsychotherapy.com/uploads/1/3/0/6/130604153/9c0d276f.pdf
    • http://life101.tips/uploads/1/3/0/2/130287527/xoliselibifeju-xunimegibetejis-jexomov.pdf
    • http://madisonbows.com/uploads/1/3/0/5/130590108/46a7fd959070605.pdf
    • http://doubleeaglerealestate.net/uploads/1/3/1/1/131164549/e1d43367.pdf
    • http://larryrenton.com/uploads/1/3/1/4/131437100/2753668.pdf
    • http://southernor.com/uploads/1/3/1/3/131398278/guxepewowepe_nopokosajov.pdf
    • http://hillclimbracingtips.com/uploads/1/3/1/8/131857112/biwupinejonuzejizewo.pdf
    • http://edtyllshow.com/uploads/1/3/0/6/130603918/vanikakoza-tidugunifor-duzudupimerevut.pdf
    • http://beexceptionalmeals.co/uploads/1/3/0/6/130605111/garalufupusiji.pdf
    • http://oksk8co.com/uploads/1/3/0/2/130289696/743927.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006093.bin
a5517cf86203419ed0dd5e18e6e16d5a598b0bbcde0c84b4d1ed886ee7ebb642		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6093 10608 bytes

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