Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb459d43361e14cb…

MALICIOUS

PDF

34.2 KB Authoring application: GIMP
MD5: 18beefa2a423bf7624884d1e19c5f208 SHA-1: 41811e9a254f67942b468839ba2393ab8b10b4ea SHA-256: fb459d43361e14cb60058319ebdaadac4893202c17666e9cb7e1a761b9eb0c9c
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of embedded URLs pointing to external PDF files hosted on various domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or traffic redirection. No scripts were extracted, but the sheer volume of external links is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.
  • ClamAV: Pdf.Phishing.TtraffRobotInstall-7605656-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.TtraffRobotInstall-7605656-0
  • 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://latecritic.com/uploads/1/3/0/7/130776724/5baf624f1a54cb5.pdf
    • http://sitesavings.shop/uploads/1/3/0/8/130814769/zoloj-kezutav-nulobewetugam-zunon.pdf
    • http://maimanistation.com/uploads/1/3/0/6/130603814/1935076.pdf
    • http://collaborativeservice.com/uploads/1/3/0/7/130738603/mifobalo.pdf
    • http://mooregoodhairdays.com/uploads/1/3/0/6/130620657/3618ae8bc5a6.pdf
    • http://myelitestaffinggroup.com/uploads/1/3/0/7/130740464/4b0187e.pdf
    • http://nctfconcealment.com/uploads/1/3/0/7/130739119/2102923.pdf
    • http://advershops.com/uploads/1/3/0/4/130435835/8786281.pdf
    • http://midlandfencepros.com/uploads/1/3/0/7/130738487/zigamamewaf.pdf
    • http://www.lpophilippines.net/uploads/1/3/0/8/130813037/6671993.pdf
    • http://ceramikerie.de/uploads/1/3/0/5/130544009/8912bc3.pdf
    • http://danielreist.org/uploads/1/3/0/2/130273733/bozol_lepodim_rixap.pdf
    • http://mianfeisongtiyanjinyulecheng.br3h.com/uploads/1/3/0/2/130270911/130270911.html#umbrella+academy+comic+timeline
    • http://www.lpophilippines.net/uploads/1/3/0/8/13

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000307b.bin
8000ebf17d30fa944a9a0b1ab7051fecaf22d0c4a6fac5959de2b3799ad64825		 pdf-font-stream PDF embedded font (sfnt) at offset 0x307B 7012 bytes

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