Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7237b5a3c47f7e3…

MALICIOUS

PDF

61.4 KB Created: 2020-05-15 10:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b29e95350b5a5f87a4e29ce8f7e39f7 SHA-1: 0685450fe03803d83bc181c4d3ffe0e6782f5a01 SHA-256: e7237b5a3c47f7e3493643d27360e8137fa775076ae1da837051fb8c0fcea94f
94 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 of which are numerically or generically named, suggesting a link farm designed to distribute traffic to various potentially malicious sites. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that appears to be a lure for technical information, likely to encourage clicks on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://kenjoconsulting.com/uploads/1/3/0/4/130483806/130483806.html#cisco+ix5000+troubleshooting+guide
    • http://creativespiritzlimited.com/uploads/1/3/0/4/130483198/tozufixabomi-bugedavulujin-regoj-garevire.pdf
    • http://caldelazstore.com/uploads/1/3/0/5/130588617/338427.pdf
    • http://smithvetservices.com/uploads/1/3/1/4/131437477/zabulega-bogimug-sudap-sudofewuzesixuz.pdf
    • http://cricketkustomz.com/uploads/1/3/0/6/130639535/9161640.pdf
    • http://gyrotech.org/uploads/1/3/0/5/130590191/1d86c9f736fe5.pdf
    • http://globalfamilyenterpriseadvisors.com/uploads/1/3/1/4/131454396/a9f14fad08.pdf
    • http://jessicabeautylightening.com/uploads/1/3/0/2/130288893/7f446.pdf
    • http://topfairfaxdentists.com/uploads/1/3/0/4/130489926/nesujaxudolexun.pdf
    • http://stephaniesfight.org/uploads/1/3/1/4/131407892/betasosadajev.pdf
    • http://barbarajames-artist.com/uploads/1/3/1/0/131070820/c3f893ce7.pdf
    • http://vilivinggroup.com/uploads/1/3/0/2/130270901/buwenefegivanofujum.pdf
    • http://fortispmc.com/uploads/1/3/1/4/131438348/zixodukes.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_off0000c150.bin
233a44eb94e74785b398486b0e1d60f9c274ed8001ab05875f0491abdb2e2761		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC150 11876 bytes

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