Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa1e6b8544d2c0b1…

MALICIOUS

PDF

31.9 KB Created: 2020-04-12 11:32:35 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 7da180c644d4a6d855301b0a160c3bac SHA-1: f5e6c62625412c3d3b300973aaee57e60fd7f0cb SHA-256: aa1e6b8544d2c0b1b23923d41b682e81edb5a9750ed045c8565e29cac40ed1ba
62 Risk Score

Malware Insights

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

The PDF contains a large number of external links, detected by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files on different domains. The document body contains garbled text and what appears to be metadata, but the primary malicious intent is inferred from the extensive link farm. No scripts were extracted from this sample. The IOCs are the URLs identified as part of the link farm.

Heuristics 3

  • 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
  • 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://opssecurityagency.com/uploads/1/3/0/6/130620716/130620716.html#ejemplo+de+funcion+promedio.si+en+excel
    • http://andyryalsglass.com/uploads/1/3/1/4/131437883/wiwerakot.pdf
    • http://christianeducational.net/uploads/1/3/1/3/131380754/71ebc243095.pdf
    • http://creativecoast.de/uploads/1/3/1/4/131483383/rixisuput.pdf
    • http://laurinanorris.ca/uploads/1/3/0/6/130621108/rimuw.pdf
    • http://jasy.eu/uploads/1/3/0/8/130874026/nisokikofudojo.pdf
    • http://lifeadored.com/uploads/1/3/0/7/130774964/3034419.pdf
    • http://sunrisefishcompany.com/uploads/1/3/1/4/131437396/fuforebafosexepok.pdf
    • http://gypsywomangallery.com/uploads/1/3/1/4/131409597/pujudemeruf-xonakosib-fisaloj-tulul.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_off00005291.bin
254985501ef9c7ce52051986e59a4a5c09188b3ec18cc3b7b0bdb73c06ba4551		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5291 8552 bytes

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