Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c48a19951e4e389…

MALICIOUS

PDF

40.3 KB Authoring application: Pdftk
MD5: cc4edc4a66556e6600ab0049ba17778d SHA-1: a3b8ea623c606f1df2e19c570a9e5d133db11b64 SHA-256: 6c48a19951e4e3894ecaeecfc3f0e8365100b674af2f6629d5bf2bdddbda7134
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded external links, as indicated by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a coordinated effort to distribute content or manipulate search engine results. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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://michaelsilveyiptec.com/uploads/1/3/0/6/130621392/3c5b5.pdf
    • http://no-drift.com/uploads/1/3/0/5/130550841/ledumekusitopejabe.pdf
    • http://kitai-journal.ru/uploads/2020/01/28/sizovilepasis-wutiwukasirapow-werizinukedosu.pdf
    • http://stjames-madnews.net/uploads/1/3/0/6/130621165/4417685.pdf
    • http://contractlawtraining.com/uploads/1/3/0/7/130739419/jobuzu-xajebuku.pdf
    • http://montcoglass.com/uploads/1/3/0/6/130621406/d6041ba1224.pdf
    • http://frontlinefordogs.net/uploads/1/3/0/6/130604639/megajosonugakawiba.pdf
    • http://msgrp.us/uploads/1/3/0/2/130273617/130273617.html#la+voile+six+fours
    • http://linux.thai.net/projects/fonts-tlwg
    • http://www.thaitux.info

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000011bb.bin
b8d675eb3f53c624baf8d00f2417bdad6bf8eb8f1a5b9f646e0676cf476dcdb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB 9884 bytes
font_01_sfnt_off0000518f.bin
571e786954638e090a09dcdaef05194fa03ab856b5c873af8aab9c9bafa3c74a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x518F 11884 bytes

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