Malicious PDF — malware analysis report

Static analysis result for SHA-256 21331057ee3b5a77…

MALICIOUS

PDF

29.2 KB Created: 2020-06-11 21:42:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a47e64acccc7da2aed39948e23e81e4 SHA-1: 27853a6e3e0c8b37755d69832551dcfc70a38dcf SHA-256: 21331057ee3b5a7787592b0d52b46c4c3db513f8ae2aa2d605dad87749763648
92 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO poisoning or to direct users to malicious sites. The document body, though partially corrupted, mentions 'Mira 723 installation guide', suggesting a lure. The PDF_SEO_LINK_FARM heuristic firing indicates a deliberate attempt to create a link farm, likely for malicious purposes. The ML classifier also strongly flagged this PDF as malicious.

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://capo-modding.com/uploads/1/3/0/6/130620314/130620314.html#mira+723+installation+guide
    • http://berlenllc.com/uploads/1/3/0/9/130969840/jejovigig_taxedadukole_mijutojediwide_xididek.pdf
    • http://chrischerryconstruction.com/uploads/1/3/0/7/130775123/213740.pdf
    • http://omgihaveakid.com/uploads/1/3/0/7/130739049/3444704.pdf
    • http://webmail.leadfluence.net/uploads/1/3/0/6/130639350/2681112.pdf
    • https://turabiza121509985.files.wordpress.com/2020/06/47690998530.pdf
    • https://fuwetatew.files.wordpress.com/2020/06/1289155934.pdf
    • https://bejuboponoku.files.wordpress.com/2020/06/dusapuwiwoxunugovo.pdf
    • https://towawawoma.files.wordpress.com/2020/06/lidujawagu.pdf
    • https://xajilaxaluv.files.wordpress.com/2020/06/kojifatijuzoxapew.pdf
    • https://gonotof.files.wordpress.com/2020/06/bebaderovadub.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_off000047ad.bin
737228272003599de10d302c81fde0e3559de602e32a3e4a01c365099c080004		 pdf-font-stream PDF embedded font (sfnt) at offset 0x47AD 9548 bytes

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