Malicious PDF — malware analysis report

Static analysis result for SHA-256 683c4a850471f34c…

MALICIOUS

PDF

37.9 KB Authoring application: Solid Converter PDF
MD5: 2b32829a64dc09857f7ac3c256ce3c46 SHA-1: 93d240e5819a06214bd3b170984b2497720e9ae1 SHA-256: 683c4a850471f34c4feebaa191bba20ca60d7de2cfa3d2eed78c71d48261172e
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links to external PDF files hosted on various domains, as indicated by the PDF_SEO_LINK_FARM heuristic. This suggests a tactic to distribute or redirect users to malicious content. The ML_NYX_PDF_MALICIOUS and ClamAV detections further support the malicious nature of the file. While no scripts were explicitly extracted, the structure and heuristics point towards a phishing or content-distribution scheme.

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://trondekyouthservices.com/uploads/1/3/0/6/130603737/puvisutekuxik.pdf
    • http://neurodiverseatl.org/uploads/1/3/0/5/130550760/1c6f3aab.pdf
    • http://bbcsalberta.com/uploads/1/3/0/5/130550738/bojopan-pibiw.pdf
    • http://woodlandstuition.com/uploads/1/3/0/4/130483860/130483860.html#useful+phrases+for+writing+a+restaurant+review

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000101b.bin
377d71b57721e1fbb72b1c5d97fdd87f66c860f2708f03a8195573f6f2e3e8d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101B 8508 bytes

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