Malicious PDF — malware analysis report

Static analysis result for SHA-256 8299585b36f40087…

MALICIOUS

PDF

43.5 KB Created: 2020-11-07 07:22:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 88c1dd1504ea141f58d6c80f69a5d8ed SHA-1: 29facafecbb84b22f86364e2b86ef06599cd52e3 SHA-256: 8299585b36f400872275edbaa0e3b01f6f9c66a665c12e308e6ee4a9ab015ab3
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, with a specific heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One of the primary URLs extracted, 'https://trafficel.ru/aws?keyword=what+is+a+hypodense+liver+lesion', suggests a content-luring tactic. The presence of numerous PDF links, including one pointing to 'https://s3.amazonaws.com/zufojadibi/kogadiwejabuxigokolidu.pdf', indicates a potential attempt to distribute further malicious content or engage in SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://trafficel.ru/aws?keyword=what+is+a+hypodense+liver+lesion
    • https://cdn-cms.f-static.net/uploads/4415929/normal_5fa35e6a4f6fb.pdf
    • https://kiseridebajesa.weebly.com/uploads/1/3/1/4/131408791/2561900.pdf
    • https://cdn-cms.f-static.net/uploads/4402938/normal_5f995cd7302a5.pdf
    • https://cdn-cms.f-static.net/uploads/4403806/normal_5fa11fc93eb38.pdf
    • https://xumusiroti.weebly.com/uploads/1/3/4/3/134321309/vuvisaj-xazad-tolanuxeg.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zufojadibi/kogadiwejabuxigokolidu.pdf
    • https://uploads.strikinglycdn.com/files/08e2cdb9-9455-41fb-bc15-63f5a5a44e7a/floss_holder_for_braces.pdf
    • https://dafupexun.files.wordpress.com/2020/11/nanogivexodudoroxirodowol.pdf
    • https://dokilujaze.files.wordpress.com/2020/11/46505601668.pdf
    • https://uploads.strikinglycdn.com/files/8d73d9d8-7007-4ac1-857f-a2c0240e8923/36768693174.pdf
    • https://dokawedog.files.wordpress.com/2020/11/duplicate_b_form_nadra.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000079d9.bin
056c4f12eefba0e2fb0ebca5780ede80bb354edc9fdbc5b8667f336668097c02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79D9 5220 bytes
font_01_sfnt_off00008bac.bin
7b1fe4a3c9b5e82aab188b90e02cca0cb0fe378bd19f44faeca662c460c7933d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BAC 10308 bytes

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