Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0cccfddb1ece5b6…

MALICIOUS

PDF

48.3 KB Created: 2020-04-03 04:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c1ce7322ca49e06be1c646a1dac4119f SHA-1: a67459178f5cd2f031581bb0aa7569bfa4a28a41 SHA-256: c0cccfddb1ece5b6f449414104ecbc73e9794d44527bd985b3092b8ab4b14c2f
92 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files on different domains. This behavior is indicative of a link farm, often used for SEO manipulation or to distribute malicious payloads. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted from this sample.

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://clairepinci.com/uploads/1/3/0/4/130476502/130476502.html#chemfiesta+electron+configuration+practice+worksheet+answer+key
    • http://nestgiftsdecor.com/uploads/1/3/0/5/130551342/231238.pdf
    • http://alikimccainart.com/uploads/1/3/0/2/130289641/wejidakapime-sanikakum.pdf
    • http://myhouseathens.com/uploads/1/3/0/7/130776486/1810084.pdf
    • http://sv-og-erp.de/uploads/1/3/0/6/130621721/c08bbb3ee.pdf
    • http://remaxoptima.net/uploads/1/3/0/8/130813428/3301036.pdf
    • http://cornerstonequalityroofs.com/uploads/1/3/0/6/130639355/tidolexawiwuk.pdf
    • http://dooblicity.com/uploads/1/3/1/3/131379904/medepo.pdf
    • http://leadville2019.com/uploads/1/3/0/6/130620670/6edf166.pdf
    • http://gavinsawyer.com/uploads/1/3/1/4/131407195/bf02e8738492b.pdf
    • http://computergeekstore.com/uploads/1/3/0/6/130620798/lajanupeguba.pdf
    • http://lifecoachingsessions.com/uploads/1/3/0/6/130639839/wetupoxalem.pdf
    • http://nesgoda.org/uploads/1/3/0/6/130622104/5994007.pdf
    • http://vsp.sala.ubc.ca/uploads/1/3/1/0/131071290/radetojepufan_fakoxavolo.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_off00007bec.bin
bc3f1637162a106d910aeac1c9b6cb0c0918fd909d04a46d3a252746c9722354		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BEC 8120 bytes
font_01_sfnt_off00009b6a.bin
bf200d18e19946c0b0757b567786460443e5edd45d7f6ac2f97d83b842ba7eea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B6A 16244 bytes

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