Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a6f94f5d9d34229…

MALICIOUS

PDF

56.4 KB Authoring application: Smallpdf Desktop
MD5: c2277844e6dca80069df227597a9f14b SHA-1: 0f5d19161f869f300dbc2db61cb58c88f17fcb05 SHA-256: 3a6f94f5d9d34229692c1c3f6bf279bb7547ad3d9f148f4d5bca040829af6488
150 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics, including ClamAV detection as 'Pdf.Phishing.TtraffRobotInstall-7605656-0' and a PDF_SEO_LINK_FARM rule. The ML classifier also strongly indicated maliciousness. The document contains a large number of embedded external URLs, suggesting a phishing or content distribution scheme. No scripts were extracted, and the document body content is largely unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://moderngentlemanacademy.com/uploads/1/3/0/5/130545128/8fb2b9.pdf
    • http://sojusurvivor.com/uploads/1/3/0/7/130775279/23755c8482d.pdf
    • http://nicoleadriennephotography.com/uploads/1/3/0/6/130603704/juralam_bupibuteranux_riwaratu.pdf
    • http://campbellsdental.com/uploads/1/3/0/4/130483989/6faebfb1cb.pdf
    • http://michaelquesnel.com/uploads/1/3/0/5/130588644/muporiwizumizijiwi.pdf
    • http://danlynnwatt.com/uploads/1/3/0/6/130639634/kemadimafewi.pdf
    • http://wit-ism.com/uploads/1/3/0/6/130620202/130620202.html#effective+lecture+presentation+skills+ppt

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001205.bin
508ff4b3870c2a40e15e979447d98fc31bdb2963e56af4101d96eb59a4e9ad3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1205 8720 bytes

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