Malicious PDF — malware analysis report

Static analysis result for SHA-256 66c5e2ee89459517…

MALICIOUS

PDF

34.9 KB Created: 2020-04-07 09:48:38 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: bc6d855852e85d1a6725fcf8fd99651e SHA-1: d24025cd77a4856893e4c5cf0edc5f985ccf7a56 SHA-256: 66c5e2ee89459517c53f7b502deb9e4dfed6acebb8b12da8f7c5254cd0a1d4b1
96 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which appear to be part of a link farm designed to artificially boost search engine rankings. The document body, though heavily obfuscated, contains references to academic materials and URLs that suggest a lure to trick users into visiting these sites. The ML classifier strongly indicated maliciousness, supporting the interpretation that this PDF is used for SEO spam or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://rapid-offroad.com/uploads/1/3/0/2/130271185/130271185.html#holes+anatomy+and+physiology+15th+edition+lab+manual+answers
    • http://tiptopconcretesealingcoloring.com/uploads/1/3/0/7/130738882/b04c073a9c7c20a.pdf
    • http://shirtsontopic.com/uploads/1/3/0/6/130621941/8995684.pdf
    • http://zekiru.com/uploads/1/3/0/3/130323755/8515700.pdf
    • http://directwindowinstallers.com/uploads/1/3/1/4/131437806/8537044.pdf
    • http://impacttogrow.com/uploads/1/3/0/6/130620731/sewavumikepo_lixuzopimapuzu.pdf
    • http://cglivingston.com/uploads/1/3/0/6/130620961/2063402.pdf
    • http://carolhunterphillips.com/uploads/1/3/0/5/130588173/2227306.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_off0000613c.bin
daf9bc7c228807b84205806bdb35cf5e7caaac294ffd5df3fe080680712a95e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x613C 7476 bytes

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