Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a5dd8057c8a70e8…

MALICIOUS

PDF

72.6 KB Created: 2020-05-13 22:53:56 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a96ae0f352537d01d05fcbf77cb11955 SHA-1: 9792d092f3261457a1e24f34d87b870f360cff59 SHA-256: 8a5dd8057c8a70e8bf86ef7a27a92ac2418529b9ffd44e1ffab4d9522c779fca
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, many of which are numerically or generically named, suggesting a link farm designed to attract search engine traffic. The primary lure appears to be 'school counselor interview questions pdf'. The PDF_SEO_LINK_FARM heuristic firing confirms this behavior. The ML classifier also strongly indicated maliciousness. No scripts were extracted from this sample.

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://ustraveldocuments.org/uploads/1/3/0/7/130774978/130774978.html#school+counselor+interview+questions+pdf
    • http://sourcesounding.com/uploads/1/3/0/4/130476378/3512328.pdf
    • http://conzensclass.com/uploads/1/3/0/4/130436261/levorat_fodafekaleze.pdf
    • http://compassionate-counseling-consulting.com/uploads/1/3/0/9/130969283/vototiduda.pdf
    • http://appelsmeier.com/uploads/1/3/1/3/131379360/7361108.pdf
    • http://bargainlivingeugene.com/uploads/1/3/1/4/131407630/nakudufinup-vobut.pdf
    • http://premierbeachpropertymanagement.com/uploads/1/3/0/3/130379581/5381d4f1095ceb.pdf
    • http://djdaroux.com/uploads/1/3/0/8/130813645/8edfb8ddca2410.pdf
    • http://yourworkfromhomesource.com/uploads/1/3/1/4/131407408/80a6d3bfc81.pdf
    • http://willadevlin.com/uploads/1/3/0/4/130435966/pefojit.pdf
    • http://hempcultivationexperts.com/uploads/1/3/1/8/131856096/8267091.pdf
    • http://johnstonbaptist.com/uploads/1/3/0/6/130640094/sutexono.pdf
    • http://saltomagico1.com/uploads/1/3/0/6/130604182/2b36e5b6a08c.pdf
    • http://ambarnatureinyourskin.com/uploads/1/3/0/7/130775782/1c74f8551.pdf
    • http://vitafinancial.net/uploads/1/3/1/4/131437252/lovufeputariwis-lumiz.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_off0000f36f.bin
b9ce07ba6c5b5197364e971a7f30bf41aea2e25fe0477c13214962654e5095a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF36F 10408 bytes

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