Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c2a491cae14d5d6…

MALICIOUS

PDF

46.1 KB Authoring application: PDFBox
MD5: 26d5b7930f62bb2b02811e5284072403 SHA-1: 482a201623163a2e37f93f2a491bdcac16411374 SHA-256: 5c2a491cae14d5d6b1f45084aa93e497899180af0ec914a54a3470ef87aa2f89
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, indicating a link farm or a distribution mechanism for further content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the nature of the embedded links and the heuristic firings point towards an attempt to redirect users to potentially harmful 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://canberracelebranteileen.com/uploads/1/3/0/4/130488969/2449320.pdf
    • http://dayoldcupcake.com/uploads/1/3/0/6/130620512/1149972.pdf
    • http://refi-llc.net/uploads/1/3/0/5/130589264/dapakakexi_rojawa.pdf
    • http://auditfindings.net/uploads/1/3/0/7/130739542/juzofoj_xafef_pubuvawigugiwad_xopuxu.pdf
    • http://saint-tims.com/uploads/1/3/0/5/130590363/1878675.pdf
    • http://mylifeisamesspodcast.com/uploads/1/3/0/2/130271167/84e0de028bfc86c.pdf
    • http://northforkyoga.com/uploads/1/3/0/5/130544826/fiduwojag-gukusevi.pdf
    • http://posifo.migraskope.net/uploads/2020/01/28/3707829.pdf
    • http://sauerlandhypotheek.nl/uploads/1/3/0/6/130620393/130620393.html#where+the+hell+are+my+keys
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001244.bin
bd858de0487b6043b3a1cc351d551c61a0b4fee6bf2c97121506dd3b5f3bd114		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1244 9316 bytes
font_01_sfnt_off00006b97.bin
598b436daaf3d122157f8aae4d95cb5f98998d7541b527c84c982bd0659a624f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B97 16888 bytes

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