Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4a3e01f72fb95b5…

MALICIOUS

PDF

46.6 KB Created: 2020-04-07 13:29:14 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a1265e0bfb74881e303760319e559ce8 SHA-1: ae745c0c52bf7a15f55732fa5f1e6b6dd0db33d0 SHA-256: d4a3e01f72fb95b5cd9a11465a81b36b96477bf706fe1d6b85856553cd87f799
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 various domains, identified by the PDF_SEO_LINK_FARM heuristic. These links are likely intended to direct users to malicious content or phishing pages. The ML_NYX_PDF_MALICIOUS heuristic further supports the malicious nature of this document. No scripts were extracted from this sample, and the document body is heavily obfuscated, making it difficult to determine the exact lure.

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://ne-surgerycenter.net/uploads/1/3/0/2/130272435/130272435.html#como+es+un+discurso+indirecto
    • http://lsrealty.co/uploads/1/3/0/3/130323092/ranubepi_boselumeseto.pdf
    • http://twafab.com/uploads/1/3/0/9/130969709/a13f8.pdf
    • http://kathyscare.com/uploads/1/3/0/7/130738871/kuporurudika_dutomikanoso_wexaponapemez_raserukulutojif.pdf
    • http://envolvecollective.com/uploads/1/3/0/7/130740113/94580.pdf
    • http://behappyespana.com/uploads/1/3/1/4/131437532/vivebe-vuvamez-rovelefowarejil.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_off00008a88.bin
5b8ee772f0592edb7c0dc6669f47a8d68f2a73b91e5cc0f504b4a2b8a16c5118		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A88 9684 bytes

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