Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f831992fdffce30…

MALICIOUS

PDF

62.9 KB Created: 2021-01-01 14:25:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 203100e8ecb74e78db0f9a83b5bb18aa SHA-1: 92682abfc6925ee7728488386714ee4adef4178b SHA-256: 2f831992fdffce3068edebcf2d9831a5c842af1f96db4f1bc525aa43b871602f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a significant number of external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. This suggests the document's primary purpose is to act as a lure, directing users to external resources. The presence of ClamAV detection and ML classification further supports its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7654

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffine.ru/123?utm_term=vollhardt+organic+chemistry+pdf
    • https://cdn-cms.f-static.net/uploads/4415327/normal_5fd793717650a.pdf
    • https://cdn-cms.f-static.net/uploads/4475988/normal_5fad9a5986a67.pdf
    • https://cdn-cms.f-static.net/uploads/4419194/normal_5fba4ac02d5ba.pdf
    • https://cdn-cms.f-static.net/uploads/4385631/normal_5fe99ae445f20.pdf
    • https://taxufutusa.weebly.com/uploads/1/3/4/5/134514166/zagorawesapebabox.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jedadokuti/29783484841.pdf
    • https://uploads.strikinglycdn.com/files/f08405b7-2a6d-4c8f-beef-a7524db0fd6a/ase_test_dates_2019.pdf
    • https://uploads.strikinglycdn.com/files/a3fe0e94-f7cb-4c0d-8d88-cd64916e1d91/16156121370.pdf
    • https://s3.amazonaws.com/ligole/ledpin_was_not_declared_in_this_scope_arduino.pdf
    • https://s3.amazonaws.com/sesijesule/zagires.pdf
    • https://s3.amazonaws.com/rabewiruzitewa/traductor_portugues_espaol.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5d6.bin
7f0cdb020eaca4326f535c3b6482aaadf0e8534247cf7defa998c90d3c6d36fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D6 5636 bytes

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