Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfa5057f29a5aae8…

MALICIOUS

PDF

37.5 KB Authoring application: PDFBox
MD5: 49e2371071ca15348a492a06e0df3910 SHA-1: cf6530413072e29031de0cbce5da03eaba17064e SHA-256: cfa5057f29a5aae83e0c0b6c2dc4b9fced656413bbb64a77fe80ed545d8dd821
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic, which is indicative of a link farm or phishing lure. The ClamAV detection further supports its malicious nature. The document body, despite being heavily obfuscated, contains references to breathing exercises and stress relief, likely serving as a pretext to disguise the malicious intent of directing users to download other PDFs from the listed URLs.

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://1668normandy.com/uploads/1/3/0/6/130639811/wumirexojebe.pdf
    • http://mondesubtil.com/uploads/1/3/0/6/130621370/tojiferukemo-tewom.pdf
    • http://50klawn.net/uploads/1/3/0/2/130289474/ef0b81a.pdf
    • http://dekastanje.nl/uploads/1/3/0/6/130604590/9219580.pdf
    • http://newportplant.com/uploads/1/3/0/7/130739746/rojutiju.pdf
    • http://bayswaterlacrosse.com/uploads/1/3/0/6/130639915/mufotuvero.pdf
    • http://photolenka.com/uploads/1/3/0/4/130476068/sodegegikozolokoveje.pdf
    • http://mountaincresttheatre.weebly.com/uploads/1/3/0/4/130494743/silem.pdf
    • http://tcsonline.net/uploads/1/3/0/7/130739755/130739755.html#breathing+exercises+stress+relieve

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000116c.bin
0d4f9d1ca2055d153a894c44aa381da2b39843b33a5f6f6d9c3e34823d6b7830		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116C 8180 bytes

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