Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f1194a6f949fb47…

MALICIOUS

PDF

36.0 KB Created: 2020-04-19 16:32:11 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 9a90212c8e4653295eb760686e54119e SHA-1: 1ddc9b39f90121c32ef3a8e24636800338e8d25e SHA-256: 9f1194a6f949fb4791ee2814d7e4e1afb28e8d21ddb3f40393817ca1db8474d9
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, many pointing to similarly structured URLs on different domains, indicating a link farm or SEO poisoning tactic. The heuristic PDF_SEO_LINK_FARM firing confirms this, suggesting the document is designed to drive traffic to these sites. The ML classifier also flagged this PDF as malicious with high confidence. The document body text, though heavily obfuscated, contains Spanish phrases related to 'Trojan horse' and 'free PDF', reinforcing the lure.

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://drpatty.net/uploads/1/3/0/2/130271019/130271019.html#caballo+de+troya+2+pdf+gratis
    • http://geckomusic-tw.net/uploads/1/3/0/3/130379549/vafalobeporeg.pdf
    • http://frostconcrete.com/uploads/1/3/0/5/130588744/8111564.pdf
    • http://pdcamerakits.com/uploads/1/3/0/5/130551342/873867.pdf
    • http://osrsgpnow.com/uploads/1/3/0/4/130489410/1146622.pdf
    • http://adamlatifallcock.com/uploads/1/3/1/4/131453299/maziwowevudoduguvafo.pdf
    • http://dentsuaegs.com/uploads/1/3/0/5/130550920/5668856.pdf
    • http://elalmacendelcalzado.com/uploads/1/3/0/5/130590209/xaxubafefab_pazerutemep_buwituzoja.pdf
    • http://wmbcreditsolutions.com/uploads/1/3/0/5/130544303/5751401.pdf
    • http://cbdoutreach.com/uploads/1/3/0/7/130738819/ranisa.pdf
    • http://johannamiller.com/uploads/1/3/0/6/130604182/6983698.pdf
    • http://natinelflowerslinensandrentals.com/uploads/1/3/1/4/131437380/413285.pdf
    • http://bernerayhistorical.com/uploads/1/3/0/8/130814861/9627426.pdf
    • http://samdaiber.com/uploads/1/3/0/4/130489649/gujefowaso.pdf
    • http://travelingtrash.com/uploads/1/3/0/6/130604948/2e2015f7f5223.pdf
    • http://trentsandifur.com/uploads/1/3/1/4/131483148/lafapozul_kizulepe_wofeso_xireje.pdf
    • http://cbdoutreach.com/uploads/1/3/0/7/1307388
    • 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_off00006120.bin
2c261293d74c75e22b90ae045512f952bc77ce1f5d5e0954f193f6b4a411bef2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6120 9156 bytes

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