Malicious PDF — malware analysis report

Static analysis result for SHA-256 c23a6cff85121b86…

MALICIOUS

PDF

43.8 KB Created: 2020-04-15 04:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 038dccbe73a8387ecdcd52bae9128ff9 SHA-1: 35bbaba08dadde14c689dd5fcccdea9d8510ef93 SHA-256: c23a6cff85121b8691f3cfc1423ce9ed22dea1f9ac936c04183777e88ffbb1d8
92 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which point to unrelated domains and appear to be part of a link farm designed to manipulate search engine results. The document body, though heavily obfuscated, contains a reference to 'Nest cam outdoor security camera installation guide', suggesting a lure to entice users to click on the malicious links. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://kylaconner.com/uploads/1/3/1/0/131070527/131070527.html#nest+cam+outdoor+security+camera+installation+guide
    • http://thedomesticmarine-codetalkerseries.com/uploads/1/3/0/9/130969502/42bab0db8cead58.pdf
    • http://aurorahardwoodwest.com/uploads/1/3/1/1/131163991/novukitut.pdf
    • http://midcoastshoppe.com/uploads/1/3/0/7/130775735/borimusi-nupin.pdf
    • http://fruitsofcompassion.com/uploads/1/3/1/4/131406433/xoninafinepego.pdf
    • http://mehr-solar.com/uploads/1/3/0/9/130969465/c3b2db96677.pdf
    • http://arcgengenhariadeaplicacao.com/uploads/1/3/1/3/131380081/9b8e9b6f91bfd72.pdf
    • http://rosevilleweb.com/uploads/1/3/0/9/130969764/bdc6a.pdf
    • http://crispandsmooth.com/uploads/1/3/0/5/130551124/xakubitibuvimebo.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_off0000841f.bin
48d0f85f26449a91790dbdc19df0a224c651942609a91d7fc24eff6235da1ff9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x841F 7980 bytes

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