Malicious PDF — malware analysis report

Static analysis result for SHA-256 551c8efc3c49674c…

MALICIOUS

PDF

28.9 KB Authoring application: GIMP
MD5: b5f832784eadb9dafcc2093b01122694 SHA-1: 512efa16c0f62a0893a16e870bfef133ef3d16ed SHA-256: 551c8efc3c49674c2c76b89553e0623f110df166fc63a7b6a4949b883ddf50cb
150 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of embedded URLs, many of which follow a pattern suggesting SEO manipulation or a link farm. The document body, though containing technical terms, also includes these URLs, indicating a likely intent to redirect users to potentially harmful content. The primary attack pattern observed is the extensive use of external links within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://helpeducatethechildren.org/uploads/1/3/0/5/130588550/9987399.pdf
    • http://mta-sts.mx.brooksequestrian.com/uploads/1/3/0/3/130313002/ecd6335b0f3.pdf
    • http://shanghaigin.com/uploads/1/3/0/6/130639116/2bcaaa.pdf
    • http://trippyprints.art/uploads/1/3/0/3/130323522/purob-rixoxepub-gowidumerotu.pdf
    • http://aliveyouthmebc.com/uploads/1/3/0/7/130739037/167e954a8.pdf
    • http://autodiscover.creech4sheriff.com/uploads/1/3/0/6/130605186/942931b.pdf
    • http://omgradine.com/uploads/1/3/0/2/130287295/651f6a46c00953.pdf
    • http://portalindustries.org/uploads/1/3/0/4/130491418/visedad.pdf
    • http://rfleasingga.com/uploads/1/3/0/6/130639750/kasejuso_pupif_pijoredamole.pdf
    • http://fetalcardio.org/uploads/1/3/0/6/130639054/248f9d5.pdf
    • http://twofacesonefist.com/uploads/1/3/0/3/130313700/4beef47.pdf
    • http://ninistone.com/uploads/1/3/0/6/130603861/gowikik.pdf
    • http://hostmaster.100naturalequine.co.uk/uploads/1/3/0/6/130620695/bobubiwaf.pdf
    • http://raulfortes.com/uploads/1/3/0/3/130313624/9037359.pdf
    • http://knowledgesculpturewave.com/uploads/1/3/0/2/130289344/5199760.pdf
    • http://tessapaige.net/uploads/1/3/0/2/130271245/5632474.pdf
    • http://maryneimanphotography.com/uploads/1/3/0/6/130620651/fafetagi.pdf
    • http://bayviewblast.com/uploads/1/3/0/6/130620519/963bc89b01e8.pdf
    • http://neuropathydoctors.net/uploads/1/3/0/7/130739387/6042021.pdf
    • http://demenagementcentury21.com/uploads/1/3/0/8/130814200/tesubuxezuwefij.pdf
    • http://blazinblazer.com/uploads/1/3/0/6/130620752/segubefesekev.pdf
    • http://adrenal14.pleasingfood.com/uploads/1/3/0/6/130605493/130605493.html#hypergeometric+distribution+density+function

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001648.bin
e771224acab39ed37841e0af5a4a5e9118432c8bbb030a505a1b971ac684b60e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1648 5744 bytes

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