Malicious PDF — malware analysis report

Static analysis result for SHA-256 c51618546bf470bc…

MALICIOUS

PDF

36.1 KB Created: 2020-04-07 12:20:02 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 61ec77fe4920ef40d84e4c4cceff887c SHA-1: b5abc9392d7cd0a3cb6ea7d17d737ce2f4b2fdeb SHA-256: c51618546bf470bcd8bd61b0bc88c8d9e4e65969bdf5d5cff9afa3d7444635c3
62 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDFs on various domains. This behavior is indicative of a link farm or SEO manipulation tactic, likely intended to drive traffic or distribute further malicious content. The document body contains garbled text and a reference to '1 decimeter is equal how many centimeters', suggesting a lure to engage the user. No scripts were extracted from this sample.

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://easyfreelegal.com/uploads/1/3/0/6/130605338/130605338.html#1+decimeter+is+equal+how+many+centimeters
    • http://soulsjam.com/uploads/1/3/0/6/130620456/bunepofulesemej-rewizowugi-wozuz.pdf
    • http://newspiritholdings.com/uploads/1/3/1/3/131383264/bimisisojuvosi.pdf
    • http://docruby.me/uploads/1/3/1/3/131379189/nilisoravanirololuvo.pdf
    • http://nebraskachambers.org/uploads/1/3/0/7/130776266/9853266.pdf
    • http://brandinnovation.site/uploads/1/3/0/8/130874283/9556672.pdf
    • http://alswirkinderwaren.com/uploads/1/3/0/6/130621665/8f000.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_off00005578.bin
b00031414d12485635eef3775b8297e1a5b52a4b31aa66893a9e35bab4e7dcb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5578 8128 bytes
font_01_sfnt_off000074c6.bin
885781ec91db75dc8c4a6a3d3dac0324bdfdb8f2239dab70466c62035ae072da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74C6 4144 bytes

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