Malicious PDF — malware analysis report

Static analysis result for SHA-256 eba6b376c8279d39…

MALICIOUS

PDF

29.0 KB Created: 2020-04-11 00:14:30 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 146c24e28b12971db7685b1690a137c6 SHA-1: ca8c574803f664eb84a43cc741a8caf601452e77 SHA-256: eba6b376c8279d39d3101ede9b5c0ecdf4beba0951d36e1775792eecbda9eebd
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document was flagged by an ML classifier as malicious and contains a large number of external links, many of which point to domains with numeric slugs and appear to be part of a link farm. This suggests a phishing or malware distribution campaign. No scripts were extracted from this sample, limiting the ability to determine specific execution chains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://host37.carmichaelnl.com/uploads/1/3/0/7/130776649/130776649.html#conan+exiles+carpenters+bench
    • http://proactiveparalegal.com/uploads/1/3/0/5/130543640/1622854.pdf
    • http://getchristmascash.org/uploads/1/3/0/6/130621938/dbc8f2.pdf
    • http://prettyfunplaytime.com/uploads/1/3/0/4/130489371/19032674.pdf
    • http://tidbitsfrommom.com/uploads/1/3/1/1/131164205/pevimekov.pdf
    • http://onesound.ca/uploads/1/3/1/3/131398351/xodilivomera_dagol.pdf
    • http://kansasbasketball.shop/uploads/1/3/0/9/130969717/2335323.pdf
    • http://roadiifiregrills.com/uploads/1/3/1/3/131398052/5342151.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_off00004978.bin
fa33ec373ee549c6a596b8ded81051a5d925714fc3e5a04ccd77ae7a26971818		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4978 7944 bytes

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