Malicious PDF — malware analysis report

Static analysis result for SHA-256 61c83ab9a7377fcc…

MALICIOUS

PDF

35.0 KB Authoring application: PDFBox
MD5: b8d213353d528b01fa7987ba64401aff SHA-1: f2960051a6554e42218cafcaedce132e9d67e325 SHA-256: 61c83ab9a7377fcc61030b97c4b4e37418fc8d2a524358eeb56d8d4e83c879d1
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to other PDF files, indicating a link farm designed to distribute malicious content. The ClamAV detection as 'Pdf.Phishing.TtraffRobotInstall-7605656-0' and the ML classifier strongly suggest malicious intent. The embedded URLs are likely used to redirect users to download further malware or phishing pages.

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://dasolen.duplicatarta.com/uploads/2020/01/28/galed-ridibubelifu.pdf
    • https://wagefelom.weebly.com/uploads/1/3/0/2/130287971/975f37f76940.pdf
    • http://easy-studies.com/uploads/2020/01/28/zesuwivo.pdf
    • http://jonekaj.aksenovaphoto.com/uploads/2020/01/29/lajin-nififomabebezar-pawosego.pdf
    • http://premaconsulting.com/uploads/1/3/0/4/130489410/zuvalinaji.pdf
    • http://baytowntreeservices.com/uploads/1/3/0/5/130588899/2606763.pdf
    • http://scienceroom302.com/uploads/1/3/0/3/130323182/duvamigilaluwanaf.pdf
    • https://wokezude.weebly.com/uploads/1/3/0/2/130289225/8de0703831e8a93.pdf
    • http://bodymindandsport.club/uploads/1/3/0/6/130604944/130604944.html#medscape+apk+full

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001215.bin
2c3bb4ec2cd7367fdff9679bb0c4d70ae977cd80268bb5d104e54119eb13bef7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1215 9540 bytes

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