Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4490b6f0c8baa61…

MALICIOUS

PDF

42.3 KB Created: 2020-04-03 13:30:13 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: bd8116f97f491709343d590146bdbc0a SHA-1: 687d0a6c2c86e1eb3a6808bb7471935cc3e568b0 SHA-256: c4490b6f0c8baa6130e9c810353aef146a6683cad2d5619bc4c14c60a0760de2
92 Risk Score

Malware Insights

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

The PDF document was identified as malicious by an ML classifier and contains a large number of external links, characteristic of a link farm. The primary purpose appears to be directing users to a multitude of other PDF files hosted across various domains. The document body itself contains garbled text and a few URLs, reinforcing the link farm nature of the 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://automatischtranscriberen.nl/uploads/1/3/1/4/131437484/131437484.html#introducci%C3%B3n+a+la+l%C3%B3gica+matem%C3%A1tica
    • http://74-123-75-119.mgwnet.com/uploads/1/3/1/4/131406999/rejogoxute.pdf
    • http://caronnutrition.com/uploads/1/3/0/6/130604589/sokumeb.pdf
    • http://dsy.allstars.org/uploads/1/3/0/8/130874055/zerofeguforu_kojumuvufikunuw_baxodebowuf_pokewi.pdf
    • http://theavancehotel.net/uploads/1/3/0/8/130874434/3184974.pdf
    • http://falcat-media.com/uploads/1/3/1/0/131071315/8704262.pdf
    • http://nealybirthandlactation.com/uploads/1/3/1/3/131398204/vazukodijorolaxobex.pdf
    • http://settlingforsuccess.kiwi/uploads/1/3/0/4/130483248/kerapukujetedovuxu.pdf
    • http://canadianvalleypediatrics.net/uploads/1/3/0/7/130740082/vofisitutagafogevami.pdf
    • http://jasondugan.com/uploads/1/3/0/4/130488446/jimakemenitubokixipa.pdf
    • http://jhl-consulting.de/uploads/1/3/0/2/130270775/7340200.pdf
    • http://pormanodepalo.com/uploads/1/3/0/3/130379503/6c2e5e253.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_off00006c49.bin
358fea347b33cad74ce482537e5793290055dc6a519252eefee3551418bf3595		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C49 9584 bytes
font_01_sfnt_off00008ec9.bin
c048ac4ed90d63bfae46472f65f9cf6fc0bd5e75369f2d8f28771a6d96a2731c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EC9 3156 bytes

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