Malicious PDF — malware analysis report

Static analysis result for SHA-256 252a8ed0e6d069c7…

MALICIOUS

PDF

63.3 KB Created: 2020-03-12 05:19:56 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c3e829262c599045efad7f6ac8a94d74 SHA-1: 92948fa007bec5e9c9124b568a9f80951278ce3a SHA-256: 252a8ed0e6d069c7f0d034681019b83ffb84eafaf0e7b6d1a094dd6d548aaac6
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, many of which point to similarly structured URLs on different domains. This pattern is indicative of a link farm, often used for SEO manipulation or to distribute malicious content. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of the specific lure.

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://www.sophiascheffel.com/uploads/1/3/1/0/131070880/131070880.html#project+airbus+a380+tutorial
    • http://lapaginadelreloj.com/uploads/1/3/0/4/130488993/6066778.pdf
    • http://hevservices.com/uploads/1/3/0/7/130776069/giriri-ludadonil-lotuwiroris-vefufolov.pdf
    • http://newlifeprestwick.com/uploads/1/3/0/2/130289301/9064598.pdf
    • http://beachesinsrilanka.com/uploads/1/3/0/5/130551615/03c10ac1b.pdf
    • http://liaoyulechengligong.f18.ebkf.org/uploads/1/3/0/7/130776558/04b59b1b4d47aed.pdf
    • http://nadinesteklenski.com/uploads/1/3/0/6/130639712/zeninepi_rizewo_mofefipa_luroju.pdf
    • http://sandyridgebaptistchurch.org/uploads/1/3/0/3/130323155/3919060.pdf
    • http://paitmencomp.com/uploads/1/3/0/8/130873842/539875.pdf
    • http://britemoonmarketing.com/uploads/1/3/0/7/130740073/9ed24e259.pdf
    • http://hostmaster.orcalogic.co.uk/uploads/1/3/0/9/130969865/f76c8ce5bee.pdf
    • http://makearteveryday.net/uploads/1/3/0/6/130620353/4089045.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_off0000c1bc.bin
dbf7301158ea65a69bb063eeaaaa981898c34b13d3846c3cc45cee4fab4d8445		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC1BC 9384 bytes
font_01_sfnt_off0000e553.bin
e91619dfd4c72a85464d95ef1ba4e67df13020651c42071bafbe521a61d9f7fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE553 2652 bytes

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