Malicious PDF — malware analysis report

Static analysis result for SHA-256 99211fecb2358798…

MALICIOUS

PDF

56.3 KB Created: 2020-11-24 21:02:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb6c46a144c127b346ff72e732e8d780 SHA-1: d335f3bf448033e3523b65abd55706f95b92d312 SHA-256: 99211fecb2358798882ee4a1cead92bc26224c10c568c78ba5d27be2d50c49b6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, a technique often used to redirect users to malicious websites for phishing or to download further payloads. The 'PDF_SEO_LINK_FARM' heuristic indicates a large number of external links, and the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics confirm its malicious nature. While no scripts were explicitly extracted, the PDF structure and link farm suggest an intent to exploit users via external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9413

Heuristics 4

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://trafftec.ru/strik?utm_term=the+book+of+random+tables+3+pdf
    • https://cdn-cms.f-static.net/uploads/4468843/normal_5fbb8298b243a.pdf
    • https://viserewisesu.weebly.com/uploads/1/3/4/8/134886384/010a4a5a.pdf
    • https://cdn-cms.f-static.net/uploads/4378161/normal_5f9e823a792ae.pdf
    • https://cdn-cms.f-static.net/uploads/4450243/normal_5f9fcd7f9d4f1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nonipesikiri/martin_hightower_funeral_home_obituaries.pdf
    • https://s3.amazonaws.com/vonusirukete/rilowibul.pdf
    • https://uploads.strikinglycdn.com/files/71611c97-2381-4190-96e9-1713a327e29e/dolphin_mii_data.pdf
    • https://s3.amazonaws.com/leteraxewe/dante_xxiv_purgatorio.pdf
    • https://s3.amazonaws.com/mudurixo/jerizilenuzufivaxobajut.pdf
    • https://s3.amazonaws.com/rijaliwiguvex/28553489637.pdf
    • https://s3.amazonaws.com/tuxutedi/bixamobavox.pdf
    • https://s3.amazonaws.com/zidosozawok/wuritivilipubolekim.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ac8d.bin
a9781888f66eca317cd7a46a3aed500f00afc5e831277e81b397ada807c95a3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC8D 5336 bytes
font_01_sfnt_off0000be75.bin
f90f39bb908a18ebc4a23a7a1c9aae940dc771384629dea2873beab6a6907004		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE75 10304 bytes

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