Malicious PDF — malware analysis report

Static analysis result for SHA-256 78a55c14255d38d7…

MALICIOUS

PDF

40.6 KB Authoring application: Nitro PDF
MD5: e39077b3a517c240f555d7941cb3be97 SHA-1: 837c546fa07eac42598bedf542dfabe159578ee8 SHA-256: 78a55c14255d38d7d489bd75ccdb9ddfefab5db4af7d88d45a69ca589d9e3177
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded URLs pointing to other PDF files, a technique often used for SEO manipulation or to distribute further malicious content. ClamAV detected this file as Pdf.Phishing.TtraffRobotInstall, and an ML classifier also flagged it as malicious. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

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://riversidecountyhistory.org/uploads/1/3/0/6/130639140/muzasosadabo.pdf
    • http://discovercaddogap.com/uploads/1/3/0/5/130551089/lorelukalapubu.pdf
    • http://simulacrator.com/uploads/1/3/0/4/130478360/7199094.pdf
    • http://ultrawealthyinsurance.net/uploads/1/3/0/8/130874142/6782f2d641.pdf
    • http://noddfw.com/uploads/1/3/0/4/130489564/2608207.pdf
    • http://officialbrookekelly.com/uploads/1/3/0/6/130639244/liwufiwod-numemi-jirese-lagatu.pdf
    • http://ethergate.com/uploads/1/3/0/4/130490668/mavezu_ridogalovike_bavapa_tofuz.pdf
    • http://shebroketheearth.com/uploads/1/3/0/7/130739278/venetafokim.pdf
    • http://lemurjewels.net/uploads/1/3/0/2/130270957/894b9299107.pdf
    • http://shopjollygoods.com/uploads/1/3/0/7/130776724/wizexiko_zarudujukizos_tosaxemaza_zuwexawe.pdf
    • http://jonas-family.rominastiebenphotography.com/uploads/1/3/0/6/130604430/130604430.html#fivb+beach+volleyball+2019+rankings

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000048ca.bin
091c2f9ed69070b518a0a92c4e30a0baadbb533a4a1244998e485577c4a42ba3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x48CA 8008 bytes

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