Malicious PDF — malware analysis report

Static analysis result for SHA-256 89ea95c20b1367b6…

MALICIOUS

PDF

44.6 KB Created: 2020-03-30 03:02:05 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0352fecb58a7e87032860d444fcedf0a SHA-1: 05058ef2ce6e1de6d1722ddcc2fe2bc66fd2a063 SHA-256: 89ea95c20b1367b6712a21c6f9eb8a93628a6080f9b8a7b25ce1cee22c2c2f83
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF contains a large number of external links, a technique often used for SEO spam or to redirect users to malicious sites. The PDF_SEO_LINK_FARM heuristic specifically identifies this behavior, indicating a likely attempt to manipulate search engine results or distribute malware. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body was heavily obfuscated, making it difficult to determine a more specific attack pattern beyond link farming.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://oakclass.com/uploads/1/3/0/8/130814526/130814526.html#radcliffe+brown+social+anthropology
    • http://oddlyspecificshirts.com/uploads/1/3/0/8/130814241/6cf5ef725385a6.pdf
    • http://lifesacredelements.com/uploads/1/3/0/9/130969284/7958175.pdf
    • http://allstarimagination.org/uploads/1/3/0/5/130551000/lunekamurumagad_guxib_wixozofuvabif.pdf
    • http://hopechurchchulavista.org/uploads/1/3/0/7/130740082/7151925.pdf
    • http://suiteroomsalesconsulting.com/uploads/1/3/0/7/130740618/beab268267928.pdf
    • http://tipforacure.com/uploads/1/3/1/1/131163863/lanutijepulav.pdf
    • http://montagebau.org/uploads/1/3/0/7/130775138/1096526.pdf
    • http://laocan.org/uploads/1/3/0/2/130271201/zuziginonuvuso_tipoxixeforewa.pdf
    • http://davidrossbooks.com/uploads/1/3/0/8/130813362/4a7bce1bbb5197.pdf
    • http://andrewtdemeo.com/uploads/1/3/1/3/131380495/863689.pdf
    • http://graysonmurraygolf.com/uploads/1/3/0/6/130639746/tafovotesatanax.pdf
    • http://angelviewdoodle.com/uploads/1/3/0/4/130476632/8235362.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_off00008629.bin
3db720b719c9efded8e48508a3dce57bc64b7a5c26d6bdf6a52f24f20d6c1393		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8629 8096 bytes

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