Malicious PDF — malware analysis report

Static analysis result for SHA-256 815d68b9505d3d23…

MALICIOUS

PDF

45.6 KB Created: 2020-04-18 11:15:46 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 9aa2c8d9f12789e98bc9f1169bcf58df SHA-1: 5aa2ed59d69d3ab0a7b7a85a4772991aae17eda2 SHA-256: 815d68b9505d3d23f23490644e6aec44bef3feca8e1d23fb5846c58bc0444cbe
96 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body is heavily obfuscated but contains references to URLs that are also listed in the extracted URLs. The ML classifier strongly indicates maliciousness, and the overall structure suggests a link farm or redirection scheme designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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://seanpatrickwobrien.com/uploads/1/3/1/4/131437249/131437249.html#vaikom+vijayalakshmi+songs+free
    • http://jonmatthews.us/uploads/1/3/0/6/130640178/657caeb72185c0e.pdf
    • http://hippowisdom.org/uploads/1/3/0/4/130478174/a81b8.pdf
    • http://sugarsphynxlykoi.com/uploads/1/3/0/7/130775388/kelalurekumerebig.pdf
    • http://lilgrayrabbit.com/uploads/1/3/0/4/130435846/wilotijevewe_vabusug.pdf
    • http://killifire.com/uploads/1/3/0/8/130873906/kapiwefejesexebibut.pdf
    • http://eventstaffboston.com/uploads/1/3/0/5/130589033/nepajiweri.pdf
    • http://mermaidcaye.com/uploads/1/3/1/4/131407398/vofufej_nuwozatekesozo.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_off00008d4c.bin
275fa0ce9a2c96baa9eae405adb10872bc38de5960996faa90b417085c7eff9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D4C 7740 bytes

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