Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d57d7b457de8414…

MALICIOUS

PDF

28.3 KB Authoring application: OpenOffice.org
MD5: e88fa42fc269409bee2486c6d5b7a5b2 SHA-1: e77bdb0987deeeee250d9ea17e164b01e3f64976 SHA-256: 8d57d7b457de841435dd17c516b250a29b844b62ba8d81d153d472bde6b51d9a
152 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical finding for a PDF SEO link farm and a ClamAV detection for Pdf.Phishing.TtraffRobotInstall-7605656-0. The document body contains numerous embedded URLs, with http://kas.remont-msk9.icu/uploads/2020/01/29/03e5a0e6b837da.pdf being the most prominent and associated with the link farm heuristic. This suggests a phishing or malicious redirection attempt.

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://kas.remont-msk9.icu/uploads/2020/01/29/03e5a0e6b837da.pdf
    • http://tuliowig.weebly.com/uploads/1/3/0/4/130436080/8959454.pdf
    • http://mymathtutoring.com/uploads/1/3/0/6/130621620/0648884.pdf
    • https://tiwumepafekimi.weebly.com/uploads/1/3/0/5/130588417/wedefefesaxus.pdf
    • http://catchnfetch.weebly.com/uploads/1/3/0/6/130620847/fd13e0a79.pdf
    • http://vatspeak.com/uploads/1/3/0/5/130588337/xeximobinitunube.pdf
    • http://jevozuzato.paypal-support-limitted.com/uploads/2020/01/29/wadigazura.pdf
    • http://theworkingconnectionllc.net/uploads/1/3/0/6/130639212/2922327.pdf
    • http://pct4career.com/uploads/1/3/0/4/130436473/3888554.pdf
    • http://bellanetfiber.net/uploads/1/3/0/2/130289581/130289581.html#tecnologia+2+eso+ejercicios+resueltos+palancas

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000011a0.bin
c7c1ddaccdbc607758acf7d493abb263ea32af5d46d2b41d55b6eab32bb2374b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0 7632 bytes

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