Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e1fc5e73f361b44…

MALICIOUS

PDF

43.1 KB Authoring application: Karbon
MD5: ca684ba05af59931aa69499c32a783d7 SHA-1: b26aa72d7b8e29879a81cf9dc1ac3a61ad8653ca SHA-256: 5e1fc5e73f361b441764cd3b56bbae3f24d91423f323eed4f3bbef5788b68ea5
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF files hosted on different domains, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO abuse.

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://www.srvywatch.com/uploads/1/3/0/6/130603878/9992889.pdf
    • http://ninjaproxies.org/uploads/1/3/0/5/130588957/3140709.pdf
    • http://canberraveterinarycrisisfund.com/uploads/1/3/0/2/130289610/fobenafomo_jepubopilekugup_kowebafoteze.pdf
    • http://achomecleaningservices.com/uploads/1/3/0/6/130620274/valev.pdf
    • http://escaperoomcville.com/uploads/1/3/0/7/130775674/8250142.pdf
    • http://levanare.com/uploads/1/3/0/6/130639950/e1efe4b4495.pdf
    • http://dvrmirror.store/uploads/1/3/0/7/130739488/janunokemuwiven.pdf
    • http://blubloggs.com/uploads/1/3/0/2/130288926/9e84b.pdf
    • http://3daet.com/uploads/1/3/0/6/130604962/jorasowubotuserar.pdf
    • http://rebuildcm.co/uploads/1/3/0/2/130287295/bisafikevuxirefa.pdf
    • http://votened.net/uploads/1/3/0/5/130538922/6682324.pdf
    • http://isellthis.net/uploads/1/3/0/6/130604574/5a3730.pdf
    • http://baseball.peakathleticsystems.com/uploads/1/3/0/3/130323315/130323315.html#ielts+reading+passage+with+answers
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004393.bin
e85238f5b2d23b53afc21fb4b7984e7dce0ca2bb4a70220c5cef224cec90116a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4393 2804 bytes
font_01_sfnt_off00005020.bin
35652bec1b54c25ce04b070517a18312f9c9aefa5739606cbd5dedd86d4d530f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5020 8252 bytes

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