Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6f27d92ab0cdf94…

MALICIOUS

PDF

36.4 KB Authoring application: Smallpdf Desktop
MD5: 366b1eb4c674e99f263907775b9b0579 SHA-1: 8d6c38e3ded1b998bfa730d075b06f7c09b5a218 SHA-256: a6f27d92ab0cdf94a55ded0edce77b5082ac0ed7d60e361d56c302f4e0ada0fc
150 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. ClamAV detection as Pdf.Phishing.TtraffRobotInstall-7605656-0 and the ML classifier's high confidence score further indicate malicious intent. The embedded URLs are likely used to redirect users to phishing sites or download 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://wowunof.audiostart10.icu/uploads/2020/01/27/1f8d618661603.pdf
    • http://pepa.incomeproof.club/uploads/2020/01/27/ribisixakifajafubiz.pdf
    • http://mytorchdata.com/uploads/1/3/0/6/130639573/7179376.pdf
    • http://undiscoveredandbeyond.com/uploads/1/3/0/6/130620845/nomiko-newukofa.pdf
    • http://lucaazzurro.com/uploads/1/3/0/5/130544781/1d8873d137e4.pdf
    • http://deardrew318.com/uploads/1/3/0/6/130620232/gebebisekedifav.pdf
    • http://theinternationalschoolforreikihealing.com/uploads/1/3/0/6/130620947/e8190.pdf
    • http://kajajefi.technicalproduction.ru/uploads/2020/01/28/givevijug.pdf
    • http://onlocation-sh.com/uploads/1/3/0/2/130289158/130289158.html#anemia+falciforme+na+bioquimica

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001221.bin
7a79bf051dfaf4594d1e7b136548a9a5cceb43a9fe13e2caa5dd6d33bd8a2860		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1221 10188 bytes

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