Malicious PDF — malware analysis report

Static analysis result for SHA-256 317d62a8829bfeba…

MALICIOUS

PDF

34.9 KB Authoring application: QPDF
MD5: 020b168c061eec1965d41d231726184c SHA-1: caf74682832ccadc85b6f8b52055bac165f4e569 SHA-256: 317d62a8829bfeba1f49fc72fd0267f672744148219a93ad33ffdae801a5ca39
150 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files, a technique often used for SEO spam or to redirect users to malicious sites. The ClamAV detection 'Pdf.Phishing.TtraffRobotInstall-7605656-0' and the ML classifier strongly indicate malicious intent. The embedded URLs suggest a link farm designed to distribute traffic or host further malicious content.

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://jetofokeb.plecho.com/uploads/2020/01/28/kuzigu-rirogev-gulaxedeteb.pdf
    • http://strengtheningfamiliesalaska.com/uploads/1/3/0/2/130289278/3431227.pdf
    • http://gevo.rentaprice.ru/uploads/2020/01/29/8876388.pdf
    • http://messinger-systems.com/uploads/1/3/0/5/130540420/xamavuwodegije.pdf
    • http://ameliaquilts.com/uploads/1/3/0/5/130541064/zafawupepozesola.pdf
    • http://millark.net/uploads/1/3/0/6/130639133/1051767.pdf
    • http://learnmeraprojects.com/uploads/1/3/0/4/130435884/62a54c9d0fd7b4.pdf
    • http://mrmacbiblebook2.com/uploads/1/3/0/6/130620946/130620946.html#smadav+2019+free++for+windows+8

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000115c.bin
cf9bdab396cdb6c0ba7b9b0ded6b5d6ede54c5d25d65a484a3c97176974b0f09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115C 8528 bytes

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