Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b1738e8376c5b4a…

MALICIOUS

PDF

43.2 KB Authoring application: Nitro PDF
MD5: 31c21719d11ee3d849b86b7989dd6b6f SHA-1: 1916a0d99cc3c961836c1b1931ad6e1a42134dc6 SHA-256: 4b1738e8376c5b4af031f6dac4a0a94e8bcd4cf9d225b350262a511909227fe2
150 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, a common technique for SEO poisoning and phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing. The document body, though partially obfuscated, contains URLs that are part of a link farm, suggesting the primary goal is to redirect users to malicious content.

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://truckdiva.com/uploads/1/3/0/3/130313410/ec50486233.pdf
    • http://mhcs.me/uploads/1/3/0/7/130776630/zarufotodobuxikij.pdf
    • http://3dmarinerswalk.com/uploads/1/3/0/5/130545998/930f030.pdf
    • http://noclintonsnomore.com/uploads/1/3/0/4/130476572/befarosesoxudog_wopizijomuzo_gaxosoki_lowug.pdf
    • http://motorcyclespeakers.org/uploads/1/3/0/7/130739962/vurugafip-negogatetexikav-topepomegoviku.pdf
    • http://ronsokolbooks.com/uploads/1/3/0/2/130272388/8533544.pdf
    • http://stickermunk.com/uploads/1/3/0/6/130603891/48ea263.pdf
    • http://harrisonashtonphoto.com/uploads/1/3/0/2/130272511/7431937.pdf
    • http://mskeleta.com/uploads/1/3/0/6/130621780/falomo.pdf
    • http://newstylemarket.com/uploads/1/3/0/6/130604580/130604580.html#como+unir+varios+pdf+en+uno+con+adobe+acrobat

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000126a.bin
5da7cc43f2590b8c9885c902f2dae6d8818d3337bb823ba0a922bd52b82b529f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126A 9156 bytes
font_01_sfnt_off000061b8.bin
ff27d99f049fa5ec83b4c3710afe1f9aee00eb20942a9349d435d4ca5ad10f97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61B8 16388 bytes

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