Malicious PDF — malware analysis report

Static analysis result for SHA-256 83ef61810881da5b…

MALICIOUS

PDF

56.1 KB Created: 2020-03-30 10:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 9cd49de970eb120c3ba010cc71ada478 SHA-1: 575e7ed4a3078c793b96df8d2eb10df229e04d90 SHA-256: 83ef61810881da5b14bdb80fadfa591afcff2e3ef3497d3abc16973657f7ed6f
92 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The primary URL, http://webdisk.collegedemsatiu.com/uploads/1/3/1/0/131069806/131069806.html#lista+de+cotejo+segun+autores+2010, is part of this link farm. This pattern suggests the document is designed to redirect users to potentially malicious content or to manipulate search engine results.

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://webdisk.collegedemsatiu.com/uploads/1/3/1/0/131069806/131069806.html#lista+de+cotejo+segun+autores+2010
    • http://zrphotography.org/uploads/1/3/0/4/130435524/vitel.pdf
    • http://rcbuildmod.com/uploads/1/3/0/7/130740148/0d7105556182.pdf
    • http://zayinsolutions.com/uploads/1/3/0/8/130874510/3f0b389.pdf
    • http://kivelyoffice.net/uploads/1/3/0/3/130323423/8614228.pdf
    • http://danfitts.com/uploads/1/3/0/4/130476471/2739d117aa0ed.pdf
    • http://stridestronger.com/uploads/1/3/0/8/130813851/1372528.pdf
    • http://studio450.com/uploads/1/3/0/6/130604061/fegonuwuz.pdf
    • http://realestatecareerhampsteadnc.com/uploads/1/3/0/6/130604919/9364775.pdf
    • http://www.cafeklatsch-ueffeln.de/uploads/1/3/0/6/130620431/093c6.pdf
    • http://pchelpnsupport.com/uploads/1/3/0/5/130588839/6b3b42.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_off0000afbb.bin
56ce5c17031036185bc8ab7d6a446ac9e88ada3ac50e0bd97ed1da68c59fcc21		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFBB 10028 bytes

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