Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eb1c652c304ae3c…

MALICIOUS

PDF

76.1 KB Created: 2020-04-03 15:18:25 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 53f8736c6d98b5502b3efb4bf1521b12 SHA-1: a67f263725d507da6b4c86f64ed321a92faf40f0 SHA-256: 5eb1c652c304ae3c6d04fba429ad9a820db8bdb58dba980c2563bcddabee9de0
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 as a link farm, pointing to various domains. The ML classifier strongly indicated maliciousness, and the presence of numerous suspicious URLs suggests an attempt to redirect users to potentially harmful content. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF designed for user redirection.

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://ck8328391.com/uploads/1/3/0/9/130969090/130969090.html#pasado+simple+y+participio+de+dig
    • http://michaelvincentportfolio.com/uploads/1/3/0/6/130621461/845c9d.pdf
    • http://runstrong-ie.org/uploads/1/3/1/4/131438829/ba5ce7c889d8e79.pdf
    • http://styleplus.online/uploads/1/3/0/7/130776520/72b66be3d7.pdf
    • http://guardiansltd.com/uploads/1/3/0/5/130588222/1607201.pdf
    • http://nationalchristianhousingconference.org/uploads/1/3/0/6/130604938/niveturujopem.pdf
    • http://asnmassage.org/uploads/1/3/0/6/130620195/3549213.pdf
    • http://whatscript.com/uploads/1/3/0/8/130814065/binibij.pdf
    • http://juniperroad.info/uploads/1/3/1/4/131454027/cf8d7efc.pdf
    • http://readingexpression.com/uploads/1/3/0/3/130313400/1727994.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_off00010377.bin
b28049cc624fb1e44571337f0a08b1421e54cec6926a05aade73d3bd7de19bcf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10377 8992 bytes

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