Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b8b60e3f3d08517…

MALICIOUS

PDF

35.5 KB Authoring application: SWFTools
MD5: 21a79c1597979252b64cdc3206b80d43 SHA-1: 1550424ae544d3a46030e3100c9b5e3c7b078a0d SHA-256: 8b8b60e3f3d0851741d0830a834b506f2500aaf08ac83d8d842a51557ed8a261
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell

The PDF was flagged by ClamAV as Pdf.Phishing.TtraffRobotInstall-7605656-0 and a machine learning classifier. The heuristic PDF_SEO_LINK_FARM indicates a large number of external links, with the first being http://koches.design/uploads/1/3/0/6/130620678/71244.pdf. This suggests a phishing or SEO-based lure, aiming to redirect users to a network of potentially malicious PDF documents.

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://koches.design/uploads/1/3/0/6/130620678/71244.pdf
    • http://gottovka.ru/uploads/2020/01/28/4d4751c2ab0b2.pdf
    • http://puttingontheglitzlm.com/uploads/1/3/0/2/130291838/1657869.pdf
    • http://communitychi.com/uploads/1/3/0/6/130620436/9246222.pdf
    • https://rozilojanez.weebly.com/uploads/1/3/0/5/130590654/7dd2895108089e0.pdf
    • http://suderve.com/uploads/1/3/0/5/130589249/d1d646623f4d2.pdf
    • http://inafip.org/uploads/1/3/0/4/130436473/5992662.pdf
    • http://nupelicanparty.org/uploads/1/3/0/6/130621128/130621128.html#perforated+sheet+singapore

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001098.bin
98f22786767fa20522fe6be5d61369a8ed4b4942c260655987486d2f727bc113		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1098 7776 bytes

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