Malicious PDF — malware analysis report

Static analysis result for SHA-256 e335d368091ef1c0…

MALICIOUS

PDF

104.3 KB Authoring application: Karbon
MD5: eb0fb2d9d5b0975548c5a9619a7f8742 SHA-1: 3ee2db81effc01706f69848dae8551159611405a SHA-256: e335d368091ef1c0fbdc313f6e0c157407dfdf008faca255e14f82df08308c0b
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of embedded links to external PDF documents hosted on various domains. This behavior is indicative of a link farm, often used for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, limiting the analysis of direct payload execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://tatianasy.com/uploads/1/3/0/2/130289369/dba559ace0f1bb.pdf
    • http://starwaymarketing.com/uploads/1/3/0/3/130323972/7662230.pdf
    • http://rollitfrozencream.com/uploads/1/3/0/2/130271165/5710781.pdf
    • http://us.momotombochocolatefactory.com/uploads/1/3/0/4/130476135/130476135.html#febrile+neutropenia+guidelines+nccn+2018

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000012d1.bin
36a659c5315b5995fab46beee623d945bc0b02627925e817be75bd2dab808f9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D1 16192 bytes
font_01_sfnt_off000146e7.bin
eaf078b7d9e619b73fb149b03ba72cfbc7ea6cb34604ddd14d3416780dd3f746		 pdf-font-stream PDF embedded font (sfnt) at offset 0x146E7 16240 bytes
font_02_sfnt_off00015c5e.bin
afc52e8038b3346dca36c1ab4fea6b0d993df411b2e5def56f884332099f547d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15C5E 4544 bytes

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