Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b4a835c6d8c769d…

MALICIOUS

PDF

28.2 KB Authoring application: Karbon
MD5: c647cff4346409ece5fffe070adc890f SHA-1: 7bdb71657606f70360639982ed264ef31654cb94 SHA-256: 3b4a835c6d8c769df5981e80996bb1fd18a1dd9f8a9975246d5954bdbdb4f7af
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links to external PDF files hosted on Weebly, as indicated by the PDF_SEO_LINK_FARM heuristic. This suggests a tactic to manipulate search engine results or to distribute a large volume of content, potentially malicious. The ML_NYX_PDF_MALICIOUS and ClamAV detections further support the malicious nature of the file. No scripts were extracted from this sample.

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 https://wekedape.weebly.com/uploads/1/3/0/4/130435569/1265623.pdf
    • https://kokozedimopab.weebly.com/uploads/1/3/0/4/130483270/128869.pdf
    • https://rimepelovepag.weebly.com/uploads/1/3/0/4/130492315/4331ab3984f7.pdf
    • https://patogadinom.weebly.com/uploads/1/3/0/4/130483703/3146930.pdf
    • https://velubulixitaxus.weebly.com/uploads/1/3/0/3/130323213/a5f36525bd84.pdf
    • https://nokatubesid.weebly.com/uploads/1/3/0/3/130323381/zofozirozovujapaku.pdf
    • https://xulasijowe.weebly.com/uploads/1/3/0/5/130547038/wesiwuletuwawu.pdf
    • https://jakelese.weebly.com/uploads/1/3/0/3/130379740/tiradavofuz.pdf
    • https://zetopotaribiru.weebly.com/uploads/1/3/0/5/130543877/3651471.pdf
    • https://tovikevaxi.weebly.com/uploads/1/3/0/2/130272086/sasusiku-losewurokinozek.pdf
    • https://mixaporuwore.weebly.com/uploads/1/3/0/5/130550679/130550679.html#defining+and+non+defining+relative+clauses+exercises+4+eso

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000011f7.bin
05308923e47624e3fef0b2ac24e6e6b69f6979e176d26752cf5c36c641eba14c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7 7628 bytes

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