Malicious PDF — malware analysis report

Static analysis result for SHA-256 8950a73ae6edbcc3…

MALICIOUS

PDF

125.4 KB Created: 2020-05-03 12:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: df2c347ef7551f1322365cad50329b66 SHA-1: 0b6993db0f16a838abafaa2a0bb706bcc04684fb SHA-256: 8950a73ae6edbcc3409be9649b7b97ec7ae52a24774191dd511fa17a36161fd0
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The primary URL, http://rabbirenee.com/uploads/1/3/1/8/131872225/131872225.html#function+of+chromatin+pdf, is embedded within the document body, suggesting a lure to a website designed for SEO manipulation or to host further malicious content. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://rabbirenee.com/uploads/1/3/1/8/131872225/131872225.html#function+of+chromatin+pdf
    • http://mylifebuilder.com/uploads/1/3/1/4/131453818/10606.pdf
    • http://akbeldursun.com/uploads/1/3/0/7/130739253/113c576f328.pdf
    • http://ds-tuinwerken.com/uploads/1/3/1/3/131384536/vodezofemusazan-tupem-ritelivoz-sexugexosug.pdf
    • http://waterbedsamerica.com/uploads/1/3/1/3/131398525/26b5eac62.pdf
    • http://justacremation.com/uploads/1/3/0/5/130588687/32e4b412.pdf
    • http://ralwest.art/uploads/1/3/0/6/130621706/2976622.pdf
    • http://mariaaki.com/uploads/1/3/0/2/130271159/de5625f929b60.pdf
    • http://event251.com/uploads/1/3/0/4/130483739/bezubovejutaxo.pdf
    • http://alpenkalk.gmbh/uploads/1/3/0/5/130588894/likobosi.pdf
    • http://doggiepaws.org/uploads/1/3/0/2/130272452/819bae94bd3.pdf
    • http://walkerlessons.com/uploads/1/3/1/1/131164204/9489638.pdf
    • http://jllcapitalmarketscommercepoint.com/uploads/1/3/0/6/130604349/gubunidasepaj.pdf
    • http://sarahbuckleyart.com/uploads/1/3/0/3/130323908/29305d97.pdf
    • http://calliesuehill.com/uploads/1/3/1/3/131380021/wejadikeg.pdf
    • http://lakeeriehealth.org/uploads/1/3/0/2/130289692/84971bbcf1.pdf
    • http://deercreekarchery.com/uploads/1/3/0/6/130621093/jobasuxuru-pivowezun.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_off0001c393.bin
2d5eee7ff503e5561775d53c2dcfa3085703fcfe218e1aa7765a06bc4df9c093		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C393 12148 bytes

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