Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6b1f2518620dd83…

MALICIOUS

PDF

42.9 KB Authoring application: Adobe PDF Library 9.0
MD5: caf7367ef24f4da3f1c8fa78c9bdeaef SHA-1: 336cded4d8b6b913b9a6a8f8855c396cf4933eca SHA-256: a6b1f2518620dd8329f916ac5bb115026fc72529616f510937590f36167ef759
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of embedded links to external websites, a technique commonly used for SEO poisoning and phishing. The ClamAV detection 'Pdf.Phishing.TtraffRobotInstall-7605656-0' and the ML classifier output strongly indicate malicious intent. The primary heuristic 'PDF_SEO_LINK_FARM' confirms the presence of a link farm, directing users to potentially malicious content hosted on domains like 'mosiwubali.vipiski-besplatno22.icu'. 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 http://mosiwubali.vipiski-besplatno22.icu/uploads/2020/01/28/dubepe.pdf
    • http://infinitybisect.com/uploads/1/3/0/6/130604769/daputim.pdf
    • http://mijo.eglesmade.com/uploads/2020/01/28/mudorikol.pdf
    • http://bani.danheat-sunrain.ru/uploads/2020/01/28/1285970.pdf
    • http://onitscore.com/uploads/1/3/0/4/130483402/kupebijadowoj-litegegododiji-vomada-gixunix.pdf
    • http://aitsena.com/uploads/1/3/0/5/130589161/05bd681f7ff.pdf
    • http://comchart.weebly.com/uploads/1/3/0/2/130270957/3fcdff4543.pdf
    • http://zambiasafarihunting.com/uploads/1/3/0/5/130551696/130551696.html#incredible+india+digital+calendar+2018

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000119e.bin
0333345cbb8d03853bb88b6f602de447b2479f0ce8860df57f40163b50b548be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119E 8280 bytes
font_01_sfnt_off0000557e.bin
38abb86318c4be294aa4cbeb51309dfcf208764f83a0ea1aade0df7d0b3cec4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x557E 16428 bytes
font_02_sfnt_off00006b58.bin
70cbe7d59d04dc79f91a0dc90d11829cec8bf15b1dbedc6ee006f09babc57f70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B58 3020 bytes

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