Malicious PDF — malware analysis report

Static analysis result for SHA-256 33c9dfdaf4942e0d…

MALICIOUS

PDF

35.7 KB Authoring application: PDF Studio
MD5: c9d5fbfb873108e572d5333e64bad3b5 SHA-1: 9fcf2cfc78b7844f3583c08ae3785d34afc8e55a SHA-256: 33c9dfdaf4942e0d309cc9ce18589d68f774fdf0cdabf02ca6201c883c9b8fb6
150 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to other PDF files. The document body, though partially corrupted, includes text related to business and employee development, suggesting a lure to disguise the malicious intent. The ClamAV detection and ML classifier further confirm its malicious nature, likely as a phishing or redirection mechanism.

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://unsubscribetoviolence.com/uploads/1/3/0/5/130551251/04d97.pdf
    • https://dexivusamigazen.weebly.com/uploads/1/3/0/3/130313390/1161621.pdf
    • http://balletclassique.net/uploads/1/3/0/4/130436122/zawomu.pdf
    • http://mychinesesecret.com/uploads/1/3/0/7/130739633/9559350.pdf
    • http://namutip.veteorets.com/uploads/2020/01/28/dfcce8ba88dcf.pdf
    • http://roz.jornalcaleidoscopio.com/uploads/2020/01/28/34b63f51.pdf
    • http://seizediem.com/uploads/1/3/0/6/130620665/130620665.html#developing+critical+thinking+skills+in+employees

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000010cd.bin
e316a062aa4e244e7b7c36a01230bf869a4bc004f221e9a345370cd9a4544d97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD 7856 bytes

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