Malicious PDF — malware analysis report

Static analysis result for SHA-256 4205b24f20b38303…

MALICIOUS

PDF

31.1 KB Authoring application: LibreOffice
MD5: 2d72ae269ae4f5af7a044ef03c05a48d SHA-1: 74a778ae56fcbb4d316716313d6aee4c07a59c6e SHA-256: 4205b24f20b3830302b271e63b3e279ab9166661cf6a2df66600d648e492181e
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links to external PDF files, a technique often used for SEO poisoning or to redirect users to malicious content. The ClamAV detection as 'Pdf.Phishing.TtraffRobotInstall-7605656-0' and the ML classifier's high confidence score further support a malicious classification. The document body, while containing some obfuscated text, explicitly mentions 'Logarithmic functions worksheet with answers pdf' and includes multiple URLs, indicating a lure to 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://buretolem.best-prices.icu/uploads/2020/01/29/zarepeduji_namuvosare_wosutafe.pdf
    • http://survivingmytwentysomethings.com/uploads/1/3/0/3/130323268/vupukujabukuleperet.pdf
    • http://tau.gent/uploads/1/3/0/6/130639845/wejukoxemurovuzada.pdf
    • http://discgolflittleleague.com/uploads/1/3/0/2/130291491/gezotanu-tatovo-medibanilovuduw-fafofaziraninaf.pdf
    • http://digoryswardrobe.net/uploads/1/3/0/6/130621608/04bdcccc40b6044.pdf
    • http://essentialcleaning.vegas/uploads/1/3/0/4/130483978/64f522c1f65e.pdf
    • http://ne-surgerycenter.net/uploads/1/3/0/5/130551491/130551491.html#logarithmic+functions+worksheet+with+answers+pdf

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001198.bin
d6f2831fd21123ca124be52beede9834bfa7f2652247704e3ed72482e0affc80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1198 8112 bytes

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