Malicious PDF — malware analysis report

Static analysis result for SHA-256 5831b67bdc46c214…

MALICIOUS

PDF

45.3 KB Authoring application: Smallpdf Desktop
MD5: 0f95b4ce4c802f000790facb44144d73 SHA-1: 7bb5d1aa843099bb265deaf8b65b140b915f9c57 SHA-256: 5831b67bdc46c214d94c3290716f93add143a79d293c47a732db6c1c10e23d72
150 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The document body, though partially corrupted, mentions 'Thyroid cancer types pdf', suggesting a lure to attract users to click on the embedded links. The ClamAV detection 'Pdf.Phishing.TtraffRobotInstall-7605656-0' and the ML classifier output further support its malicious nature, likely for phishing or malware distribution.

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://dashielllaw.com/uploads/1/3/0/4/130477805/2063784.pdf
    • https://vabinazuwanino.weebly.com/uploads/1/3/0/4/130436125/1c74e1b3b3.pdf
    • http://pssdforum.com/uploads/1/3/0/5/130589345/gikezokitib-difaw-selujamikozi-bafasezowunof.pdf
    • http://mjtservices.info/uploads/1/3/0/4/130476458/koviwij.pdf
    • http://nowallsministry.net/uploads/1/3/0/5/130543070/zipezujawo.pdf
    • http://johncochranartwork.com/uploads/1/3/0/6/130621942/9daf5e8a4.pdf
    • http://molexastucco.com/uploads/1/3/0/3/130323929/952803.pdf
    • http://tridesigns.net/uploads/1/3/0/7/130775763/febezis.pdf
    • http://medterramexico.com/uploads/1/3/0/5/130589287/zolijokir-tovezerovarixus.pdf
    • http://misssupremepurityqueen.com/uploads/1/3/0/6/130620384/130620384.html#thyroid+cancer+types+pdf

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000011fb.bin
0214daf22b16cb842cd7c6819da24fd20b6d47cf680a535f0b59d84cb12684d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB 8012 bytes

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