Malicious PDF — malware analysis report

Static analysis result for SHA-256 16baadf522e32742…

MALICIOUS

PDF

43.0 KB Authoring application: ImageMagick
MD5: 351792a574b2713575d1712d89e17075 SHA-1: 5b8b0fb736bc751e1989d593c957ba64538a8555 SHA-256: 16baadf522e32742773814c63003af5e5d50420828590a74dfa81b0e5d0473c6
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a critical finding for a large external PDF link farm. The embedded URLs and the document body text, which contains references to 'simulador ser bachiller 2020 pdf', suggest a lure to external resources. While no scripts were explicitly extracted, the nature of the link farm and the ClamAV detection indicate a malicious intent, likely to distribute malware or engage in phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://norcal-cre.com/uploads/1/3/0/5/130540567/4422649.pdf
    • http://synapse-productions.com/uploads/1/3/0/7/130775629/tefiruwakaw_boxenoniduw.pdf
    • http://bayswaterlacrosse.com/uploads/1/3/0/3/130379063/8766877.pdf
    • http://talesfromsixthgrade.com/uploads/1/3/0/6/130639147/jijerem.pdf
    • http://nlightnstudio.com/uploads/1/3/0/3/130323235/nizarituzowege_guxapelajunofe_xotixipaxifiso_jemijaxuxetiz.pdf
    • http://thehnossaproject.com/uploads/1/3/0/6/130621502/130621502.html#simulador+ser+bachiller+2020+pdf
    • http://linux.thai.net/projects/fonts-tlwg
    • http://www.thaitux.info

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000012d8.bin
c38276e7195f4980b175ffcf7f7fed51a203ea59180567ea01d4f7e5800c887b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D8 9556 bytes
font_01_sfnt_off0000581a.bin
c7143368894299a997ed09f05024df052d964886bc902d598de4a6791c50751f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x581A 10292 bytes
font_02_sfnt_off00006dd8.bin
08aad6196d6ae97191b7881f243c388673954fce6805f476ab99cc2c9eda63bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DD8 1636 bytes

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