Malicious PDF — malware analysis report

Static analysis result for SHA-256 4435eb453ff90f66…

MALICIOUS

PDF

34.5 KB Authoring application: Nitro PDF
MD5: 9a5918dba3139461870d0af20475845e SHA-1: a55a893306b0071db125e565b4dcd1b20c85b209 SHA-256: 4435eb453ff90f6667f1db156890c4c5bfe60f24f6da356ad1cd7b1699a4e166
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links to external PDF files hosted on various domains. This "link farm" technique is commonly used to distribute malicious content or conduct phishing attacks. The ClamAV detection and ML classifier strongly indicate malicious intent. No scripts were extracted from this sample.

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://wallinba.com/uploads/1/3/0/7/130739011/zulefonoful.pdf
    • http://pjbarkerlaw.com/uploads/1/3/0/7/130776225/f96c21ad0b3b1.pdf
    • http://globaloptixllc.com/uploads/1/3/0/2/130289236/3dde8.pdf
    • http://claytonlamar.com/uploads/1/3/0/4/130435658/titemovexaxepo.pdf
    • http://adventureguide-outdoor.com/uploads/1/3/0/8/130814190/1055143.pdf
    • http://service.fm/uploads/1/3/0/5/130539348/dbc334e840.pdf
    • http://openldap-builds.com/uploads/1/3/0/6/130639091/3186732.pdf
    • http://mcautotransport.dk/uploads/1/3/0/6/130605002/purab.pdf
    • http://colombiahumanrights.org/uploads/1/3/0/7/130775596/tekuwipuj.pdf
    • http://paymentwave.co.uk/uploads/1/3/0/7/130738725/9701479.pdf
    • http://daleweberphotography.com/uploads/1/3/0/7/130775573/jofewelebumot_gadotoluzepepom_werapugopajako_xenosoxenumebun.pdf
    • http://x0597057xstreamtravel.xsideas.com/uploads/1/3/0/6/130639426/130639426.html#agisoft+photoscan+professional+1.4.5+crack

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002ee5.bin
4520f32cd9f32f71530432fa17d4524d1d2982c373eea47ccb8a3b0bcaf50e9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2EE5 8232 bytes

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