Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3614182b851376d…

MALICIOUS

PDF

60.7 KB Created: 2020-04-06 03:43:39 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a0696468684f796a5dd010fa3ce44c06 SHA-1: 238dc0174312781cd1b043cbfffd2be776f5220b SHA-256: a3614182b851376da1416d1cf43138bbfaf10db5158313d84950fd411a34a7af
92 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. These links point to various domains, many of which appear to be part of a link farm designed to manipulate search engine results or redirect users to malicious sites. The ML classifier also strongly flagged this PDF as malicious. 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://fondationfb.org/uploads/1/3/1/1/131163492/131163492.html#diff+eq+for+dummies
    • http://stfs-technology.net/uploads/1/3/0/4/130435876/fidesodijilutidix.pdf
    • http://encounterbtq.com/uploads/1/3/0/2/130274076/cd87dd.pdf
    • http://titletownmovers.net/uploads/1/3/1/1/131164430/zuzalipok_rumozobenepete_mexufo_subofokipodit.pdf
    • http://rpk-finland.com/uploads/1/3/1/1/131164048/f9a0c.pdf
    • http://msgholdingsbenefits.com/uploads/1/3/0/7/130739577/76a838e031a6.pdf
    • http://washingtonsungrown.com/uploads/1/3/1/3/131380284/defabisuletazup_lebor_ninivexete_zaneniropamika.pdf
    • http://millplain.org/uploads/1/3/0/7/130739201/zoruboweduturejavazu.pdf
    • http://edgelandscapeandmaintenance.com/uploads/1/3/1/4/131437849/kowilopujadodetud.pdf
    • http://klombardi.com/uploads/1/3/1/4/131406606/544ae1c.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_off0000c334.bin
b5cd6aae8b81d7170fd04c864abd77c9ae93375e2ba4e99b57e01c2111760657		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC334 8608 bytes

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