Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc5f33c2304790e3…

MALICIOUS

PDF

27.5 KB Created: 2020-05-30 05:26:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e3167331c2d32727a02bbfa8facfa31 SHA-1: aecb27104098b16c3d8263640343b6f2eb5946b9 SHA-256: cc5f33c2304790e3a3fd0f036bfe5d0dfe11f8cc42bcfbd182cf3bb68f22bc2e
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, a common technique for SEO poisoning or redirecting users to malicious sites. The ML classifier strongly flagged this PDF as malicious. The embedded URLs point to various domains, suggesting a link farm or a distributed infrastructure for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 4

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://adsl-63-204-18-41.benefitplans.org/uploads/1/3/0/5/130588256/130588256.html#peavey+mark+iii+series
    • http://shortseason.co.uk/uploads/1/3/0/4/130488295/pujizapan.pdf
    • http://goplaysport.co/uploads/1/3/0/5/130590416/betozofozot.pdf
    • http://dadicatedco.com/uploads/1/3/1/4/131438528/83ce07638d0d.pdf
    • http://warroom.ca/uploads/1/3/1/3/131384599/mojufaro-pazimufemodow.pdf
    • http://tarabarkerfineart.com/uploads/1/3/0/7/130775685/mirotabolivig-xikixafi-neverifovusuzu-rofubo.pdf
    • http://syracusenyapartmentrentals.com/uploads/1/3/0/2/130272325/4a172a6.pdf
    • http://itechcomputing.com/uploads/1/3/0/5/130551137/3111262.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_off00004301.bin
9cbaef6fe9179aec4bcfe9775a35d05f719b8487fbfac20e5026d09b85606186		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4301 9488 bytes

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