Malicious PDF — malware analysis report

Static analysis result for SHA-256 0375d8d80764a8db…

MALICIOUS

PDF

74.8 KB Created: 2020-12-28 13:14:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6acc16dcb39a34d3330a70b1f43bada SHA-1: e5d0ac75256527220500256856efe1594ce982e3 SHA-256: 0375d8d80764a8db0feea1a7ee996020082d216c9864aa77b6670efbd31e3429
154 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm for SEO purposes. The ClamAV detection and ML classifier indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the presence of numerous external URLs suggests an attempt to redirect the user to malicious sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8721

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/strik?utm_term=tetrico+falling+blocks+gameplay
    • https://cdn-cms.f-static.net/uploads/4405904/normal_5fbbbe7bcdd00.pdf
    • https://cdn-cms.f-static.net/uploads/4367631/normal_5f882f90aaad8.pdf
    • https://static.s123-cdn-static.com/uploads/4423728/normal_5fcc591ad6e23.pdf
    • https://static.s123-cdn-static.com/uploads/4490125/normal_5fc86d216eca0.pdf
    • https://cdn-cms.f-static.net/uploads/4410191/normal_5f976b78f39b8.pdf
    • https://cdn-cms.f-static.net/uploads/4403141/normal_5f90c92aeba70.pdf
    • https://gadigode.weebly.com/uploads/1/3/2/6/132680949/tubisobegelu.pdf
    • https://static.s123-cdn-static.com/uploads/4419211/normal_5fdfd1dd481b9.pdf
    • https://cdn.sqhk.co/karapazepot/UFrif4B/middle_earth_orcs_attack_rtsp.pdf
    • https://cdn-cms.f-static.net/uploads/4408865/normal_5fb2775d1d292.pdf
    • https://cdn-cms.f-static.net/uploads/4487903/normal_5fb72299226b1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e879.bin
bf2a86ad2aee69887b89bc158f5997c63c407941b2b1c2655937054db87ae987		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE879 5380 bytes
font_01_sfnt_off0000faa5.bin
e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA5 1800 bytes
font_02_sfnt_off00010333.bin
0dd22790ff3edc7b6815094f6e49f2245998c78d7ab88126bfd4b44d51390688		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10333 11388 bytes

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