Malicious PDF — malware analysis report

Static analysis result for SHA-256 945615ecc7236a41…

MALICIOUS

PDF

51.4 KB Created: 2020-04-12 07:53:54 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 000488b47281f2b2d6a0c540d885585a SHA-1: 95ab5445639665e8a72093ffaefe588edccea553 SHA-256: 945615ecc7236a414189f131aee0c5887d5ddf7fa1d8abb8a2a3ea7292d4a782
92 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDFs, a technique commonly used for SEO poisoning to drive traffic to malicious sites. The document body, though heavily obfuscated, contains a URL that appears to be part of this link farm. The ML classifier strongly indicates maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious linking behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://trouetlab.com/uploads/1/3/1/6/131637036/131637036.html#psicologia+del+color+en+marketing+pdf
    • http://woodlandtheatre.com/uploads/1/3/1/4/131453793/8cbf493c0.pdf
    • http://greencor.org/uploads/1/3/0/8/130813650/3121660.pdf
    • http://lavalegreenclinic.com/uploads/1/3/1/4/131482886/1673757.pdf
    • http://forummugla.com/uploads/1/3/0/9/130969634/gifeluxi.pdf
    • http://riomayomaderas.com/uploads/1/3/1/3/131379420/witife-parixukizawudi-livaxiregakufaw.pdf
    • http://yyc.ooo/uploads/1/3/1/0/131070207/suparugep.pdf
    • http://coybutstormy.com/uploads/1/3/0/5/130539054/segifusamebituxom.pdf
    • http://lakedistrictfellponycentre.com/uploads/1/3/0/6/130639775/laxopiwuxe-ruwulisewaw-liwojonulu.pdf
    • http://weclearstoppages.com/uploads/1/3/0/5/130551445/40f6f59.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000895e.bin
5a4e18dcbf0c2cc15b259e3b56121bf362496d23a517ec342d7983a531c0ed1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x895E 9360 bytes
font_01_sfnt_off0000aae6.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAAE6 16036 bytes

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