Malicious PDF — malware analysis report

Static analysis result for SHA-256 2148e58bf552fc43…

MALICIOUS

PDF

42.4 KB Created: 2020-04-07 12:14:07 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: bb5a2b40c4f29cedd66c1d54d219e810 SHA-1: 09f5fca3b548bfa48ef5378bce7d06a5ae6bfa64 SHA-256: 2148e58bf552fc434f7998d4cd982f4b413daa5c8bf0c7944c5821b58560833e
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links to other PDF files hosted on various domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The document body also contains a prominent URL that appears to be a lure for 'Sadlier vocabulary workshop enriched edition level b unit 11 answers'. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves directing users to these external resources, which could be for SEO manipulation or to serve further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kidsforkidscommunity.org/uploads/1/3/0/8/130814717/130814717.html#sadlier+vocabulary+workshop+enriched+edition+level+b+unit+11+answers
    • http://marianoelide.com/uploads/1/3/0/5/130588231/subamo.pdf
    • http://aquapearl.studio/uploads/1/3/0/7/130738812/4270894.pdf
    • http://fightinaddiction.com/uploads/1/3/0/5/130590763/xotomejaluleteduwib.pdf
    • http://system-betting.com/uploads/1/3/0/6/130639840/1682562.pdf
    • http://dnrdrywall.com/uploads/1/3/0/2/130289519/dusofaniwozax.pdf
    • http://composafe.com/uploads/1/3/1/4/131452878/riwaduriwuliwatudak.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_off00006dec.bin
ac97095642a7eae590dbbf4a1e7b2fa679aa06c2c995db6fe195bf21b5ef1933		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DEC 8036 bytes
font_01_sfnt_off00008cfd.bin
885781ec91db75dc8c4a6a3d3dac0324bdfdb8f2239dab70466c62035ae072da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CFD 4144 bytes

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