Malicious PDF — malware analysis report

Static analysis result for SHA-256 52b36172d6137d49…

MALICIOUS

PDF

33.1 KB Created: 2020-06-06 02:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 04e2e3ca3be4b883abed9272cfc5c5cb SHA-1: 938feba9f44b014a34135458b292513c5d6ac2d1 SHA-256: 52b36172d6137d49769cb7ebc235eb0aea13f86a7f35d0fa1c560d1f5872031c
92 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to other PDF files hosted on various domains. The document body also contains similar URLs, suggesting a link farm or redirection mechanism designed to lead users to download more malicious content. No scripts were extracted, and the primary malicious activity appears to be the distribution of further malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 3

  • 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
  • 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://hostmaster.greathorwoodhistory.org/uploads/1/3/0/4/130436181/130436181.html#callan+method+stage+1+pdf+download
    • http://gemstonecopywriters.com/uploads/1/3/1/4/131437924/puwejixidetafaziwevo.pdf
    • http://howtolifemn.com/uploads/1/3/1/6/131636775/vimidugaxadixewu.pdf
    • http://the-dollhouse-online.com/uploads/1/3/0/5/130588966/vezeboxibu-bimani-nikebuwetiwim-momolakafuxak.pdf
    • http://rbulldog.com/uploads/1/3/0/6/130640066/zetepenu.pdf
    • http://hostmaster.greathorwoodhistory.org/uploads/1/3/0/4/130436181/terms.html
    • http://hostmaster.greathorwoodhistory.org/uploads/1/3/0/4/130436181/dmca.html
    • http://hostmaster.greathorwoodhistory.org/uploads/1/3/0/4/130436181/policy.html
    • https://pezatopenez.files.wordpress.com/2020/06/niwomaleguf.pdf
    • https://nixevedat.files.wordpress.com/2020/06/zanidupofiwewimuwexa.pdf
    • https://minudesewug829894643.files.wordpress.com/2020/06/200997468.pdf
    • https://bazaroguj.files.wordpress.com/2020/06/9266103250.pdf
    • https://monijoka.files.wordpress.com/2020/06/kiremunuvufoxasare.pdf
    • https://tesukejiget.files.wordpress.com/2020/06/pejaverake.pdf
    • https://tupanap.files.wordpress.com/2020/06/71656879932.pdf
    • https://tojugodusino.files.wordpress.com/2020/06/28306157240.pdf
    • https://rozipinofoti.files.wordpress.com/2020/06/76580014469.pdf
    • https://wufasor815510325.files.wordpress.com/2020/06/83794128108.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_off000055b5.bin
5a1a4acb1502510312e828c0b0043017595d4c54d20ad3e0dc093adea25f2b10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55B5 10156 bytes

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