Malicious PDF — malware analysis report

Static analysis result for SHA-256 683dde5d6ccf8cfb…

MALICIOUS

PDF

36.6 KB Authoring application: Scribus
MD5: 7ac77e219e479d0ad7c279a9ba65af2e SHA-1: ac8b9895a2859fbd0307c9f9f8db4655d35b75e0 SHA-256: 683dde5d6ccf8cfb9b1d14d0766ca748a2beafb18e46a40443eb08413225f934
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs pointing to external PDF files, a technique often used for SEO spam or to distribute malware. ClamAV detected this file as 'Pdf.Phishing.TtraffRobotInstall-7605656-0', and a machine learning classifier also flagged it as malicious with high confidence. The document body, though heavily obfuscated, contains references to these URLs.

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://msgray.org/uploads/1/3/0/5/130590321/5f71e2d5.pdf
    • http://minnehahalawns.com/uploads/1/3/0/6/130620280/renom_loguxufu_jutexege.pdf
    • http://freefreightmatch.com/uploads/1/3/0/3/130313289/632351.pdf
    • http://curerecords.net/uploads/1/3/0/4/130436136/janamuxe-xizevisivufinun-wadaje-dawixanepaveze.pdf
    • http://starvedrockarea.com/uploads/1/3/0/6/130604522/konababitugevo.pdf
    • http://mr-riks.com/uploads/1/3/0/6/130605017/67bddf5ef88a1b.pdf
    • http://dekastanje.nl/uploads/1/3/0/2/130291766/fujuwaru.pdf
    • http://mossellsworth.com/uploads/1/3/0/6/130604789/jajejazijusumudonu.pdf
    • http://theelfbox.com/uploads/1/3/0/8/130874467/130874467.html#assure+model+of+teaching+pdf

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000011df.bin
57a24400a0444d5097ad18108df85e08e7c69a96cf170f5590ebe23c8002fc4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF 8448 bytes

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