Malicious PDF — malware analysis report

Static analysis result for SHA-256 0eafff925fc21a39…

MALICIOUS

PDF

39.4 KB Authoring application: Poppler-utils
MD5: 03bc00abc462856109e1e6052da6d284 SHA-1: e93dff1240cc4a6e76a32105b40cab5b7abb96b6 SHA-256: 0eafff925fc21a393adfae624a9f0043fcd6e1e2de5e9950d8d8a010ecdc2e77
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains a large number of external links, many of which point to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The presence of a 'remote-support tool lure' heuristic and a 'download button' heuristic, combined with the document body mentioning 'Ultraviewer for windows 10 64 bit', indicates a likely attempt to trick the user into downloading and installing potentially malicious remote access software. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://deerparktreeservices.com/uploads/1/3/0/2/130273733/retadibuj.pdf
    • http://jioulian.com/uploads/1/3/0/5/130590356/2764271474.pdf
    • http://mergeweekend.com/uploads/1/3/0/6/130621603/1651327.pdf
    • http://bulibomuka.ants-life.ru/uploads/2020/01/28/4403722.pdf
    • https://vixilirab.weebly.com/uploads/1/3/0/2/130292173/8337581.pdf
    • https://sopasolojix.weebly.com/uploads/1/3/0/2/130289625/wiweporopuxuzoridop.pdf
    • http://advizher.com/uploads/1/3/0/2/130291485/1640776.pdf
    • http://14centsaminute.com/uploads/1/3/0/2/130287960/130287960.html#ultraviewer+for+windows+10+64+bit
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000110a.bin
56a7bf01ebd2994a4192b5edee135c7da21fadbd45316e65eaa58e6f2fc24e2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110A 8220 bytes
font_01_sfnt_off00005072.bin
bf9f5eef45e7451483c1859b967753b5c44c1f4fa7b497dc285ce4025d129f63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5072 16872 bytes

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