Malicious PDF — malware analysis report

Static analysis result for SHA-256 811bb6b41322e958…

MALICIOUS

PDF

36.7 KB Created: 2020-04-06 07:37:24 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a90e769c649f667fad6cf3f131a0c6f6 SHA-1: e5ffd8f2b93577b8739234e0fe3e110f188ddad9 SHA-256: 811bb6b41322e958e5628a674a6927b46be2baa7665c4cc29699b7c9dc5678f4
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which appear to be generated for SEO purposes, indicating a link farm or SEO spam campaign. The document body, though partially corrupted, contains text related to appliance repair, likely a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious link farm.

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://ne-surgerycenter.net/uploads/1/3/0/5/130551641/130551641.html#reparacion+de+refrigeradores+samsung+guadalajara
    • http://newburycbclub.com/uploads/1/3/0/8/130814596/648e61b0e3.pdf
    • http://multiplyingdisciple.com/uploads/1/3/0/9/130969424/nolizilel-nuzider-momomixopafi.pdf
    • http://dfeservices.net/uploads/1/3/0/4/130436450/9148252.pdf
    • http://dazmedia.net/uploads/1/3/0/6/130604771/pubopamolapimadexu.pdf
    • http://mtchoirs.com/uploads/1/3/0/6/130604566/dogev.pdf
    • http://honorkeepsakes.com/uploads/1/3/0/6/130621838/6208105.pdf
    • http://1776ipasportswear.com/uploads/1/3/0/2/130289668/4900352.pdf
    • http://spiritseekingdepressive.com/uploads/1/3/1/3/131383928/d7af578c5556ab.pdf
    • http://metropolitaneprep.com/uploads/1/3/0/5/130590666/rajelarojezovo_burodesufaxori_bulek_weguza.pdf
    • http://cannabiscompounder.shop/uploads/1/3/1/4/131483069/sukuwipal.pdf
    • http://classicpinup.com/uploads/1/3/0/3/130324324/4866194.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_off00006511.bin
c209fee467fa96c6c4cef2bf1777b15d05825ff187f4e3a0428d6c43ff5a31ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6511 8380 bytes

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