Malicious PDF — malware analysis report

Static analysis result for SHA-256 049ce628ab9836ff…

MALICIOUS

PDF

68.4 KB Authoring application: Mobipocket Creator
MD5: 933272e0ab49c633ee0ea8a58fb942cd SHA-1: 412e79ad5d7531596dfb5ec17d7c30a8e9e85b6f SHA-256: 049ce628ab9836ff6e34276aed468991df999bd10c482b7d4bf8c7d64fee962c
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 further malicious content. ClamAV detected this file as 'Pdf.Phishing.TtraffRobotInstall-7605656-0', and ML classification strongly indicated maliciousness. The document body itself is heavily obfuscated but contains references to the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://biscuiteering.com/uploads/1/3/0/5/130539244/220f12.pdf
    • http://oddamericancompany.com/uploads/1/3/0/6/130604708/4410439.pdf
    • http://ketuation.ru/uploads/2020/01/29/4ed10e36.pdf
    • http://neurogastrolab.com/uploads/1/3/0/3/130379181/vebugizexebedo.pdf
    • http://ministrypartnersfunding.net/uploads/1/3/0/4/130477952/zeladenitisaresoli.pdf
    • http://susiestreats.com/uploads/1/3/0/6/130639845/buzaxazapido_womevej_posus_migoput.pdf
    • http://deardrew318.com/uploads/1/3/0/6/130621854/3848640.pdf
    • http://nobuhotelmarbella.devsite-1.com/uploads/1/3/0/5/130588269/130588269.html#wipro+directors+report+2019

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001214.bin
f92658094430869475c4985e976df17ccff69e1f84f57c16e96a59919265f689		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1214 8796 bytes

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