Malicious PDF — malware analysis report

Static analysis result for SHA-256 7106993ffb0f73e6…

MALICIOUS

PDF

35.2 KB Created: 2020-04-06 05:12:29 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: bda82007b17fcc06d3d70a6ab3337b48 SHA-1: e2b9acdb8f69eb6170e0e3b1fb986caeb9b142ef SHA-256: 7106993ffb0f73e66c6538c65bf0e0eb8656eb2d5862dc2e216e43dd3df1f84a
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though heavily obfuscated, contains URLs that are part of this link farm. The ML classifier also flagged this PDF as malicious. The primary attack pattern appears to be a link farm designed to direct users to potentially malicious content hosted on external domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://loveyourbff.com/uploads/1/3/0/7/130776245/130776245.html#proyectos+de+mejora+continua+en+calidad
    • http://hkgpublichealthprojects.com/uploads/1/3/0/6/130620859/8850048.pdf
    • http://preijersmak.net/uploads/1/3/0/4/130476594/6142399.pdf
    • http://theseabreezetavern.com/uploads/1/3/0/4/130483163/e1d9efc.pdf
    • http://citypetsnashville.com/uploads/1/3/0/2/130291485/5609213.pdf
    • http://portaferrysailsandsounds.co.uk/uploads/1/3/0/7/130776508/3507990.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_off0000623f.bin
f5ed80288cfc38b41ec92461ca23fc69b9645a03b483e46ad769b780bae87345		 pdf-font-stream PDF embedded font (sfnt) at offset 0x623F 7568 bytes

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