Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb97cd94fdcacc28…

MALICIOUS

PDF

44.7 KB Created: 2020-04-18 23:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b105c36cea5810c6b4f6808419815757 SHA-1: 83f7659168ffea6aaeefd832b553944c467b6d73 SHA-256: eb97cd94fdcacc2856b09cb81946d5840b70b738f9aa711472d291416bde4158
92 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a common technique for SEO spam or phishing. The document body, though heavily obfuscated, contains references to 'Calvin klein bikini brief size guide' and the wkhtmltopdf tool, suggesting a lure to a website. The heuristic 'PDF_SEO_LINK_FARM' strongly indicates a link farm, and the ML classifier flagged the PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://sicahpump.com/uploads/1/3/0/4/130476458/130476458.html#calvin+klein+bikini+brief+size+guide
    • http://ottavia.nl/uploads/1/3/1/4/131408954/9071927.pdf
    • http://marcbissonnettemode.com/uploads/1/3/0/3/130313132/4e06bb.pdf
    • http://laxoilpartners.com/uploads/1/3/1/3/131380337/jiruxesuw.pdf
    • http://chotchkiss.com/uploads/1/3/0/8/130874051/688e53608d5b.pdf
    • http://renfrowparrishhvac.com/uploads/1/3/0/6/130604791/bd61a4a695ddb.pdf
    • http://tripmomlists.com/uploads/1/3/0/6/130604279/leraxomutiwuli_vimofatuvakagi.pdf
    • http://millerplumbingandbackflow.net/uploads/1/3/0/8/130873769/tomezad-sujelajije-kogedose.pdf
    • http://ebzzzbeauty.com/uploads/1/3/0/6/130621501/8d6ce.pdf
    • http://chrisaylmer.com/uploads/1/3/0/7/130739776/volef.pdf
    • http://botanicalbabies.com/uploads/1/3/0/6/130620752/lotaneg_pijopi.pdf
    • http://amandathomas.net/uploads/1/3/0/2/130272571/7400934.pdf
    • http://tinycoconote.com/uploads/1/3/0/4/130491850/segifuj_zapufegagolog_katotak_suzikovesuvojo.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000765c.bin
fe17a5d7742318586dc7b730f7512b2e676bd8c6476b8aa2cb440140858aa6b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x765C 6960 bytes
font_01_sfnt_off0000918d.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x918D 16036 bytes

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