Malicious PDF — malware analysis report

Static analysis result for SHA-256 626a5bd9d88a679a…

MALICIOUS

PDF

35.7 KB Authoring application: Smallpdf Desktop
MD5: 0d76c910e19405e8a914984a6d5d3e46 SHA-1: f6193af1261a3144372611bde2c71c4e63c367f9 SHA-256: 626a5bd9d88a679adcd830c9797d247b7d763d01664268450e5b259e902d38e0
152 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, and exhibits a critical heuristic for a PDF link farm. The document body contains numerous embedded URLs pointing to external PDF files, suggesting a campaign to distribute content or manipulate search engine results. While no scripts were explicitly extracted, the nature of the link farm and the detection as 'Pdf.Phishing.TtraffRobotInstall' indicates a likely phishing or malicious redirection attempt.

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://totalaccesssolutionsltd.com/uploads/1/3/0/5/130550826/vimuwudonewigo.pdf
    • http://growingbolderfitness.com/uploads/1/3/0/6/130621143/laweguzekefisawifi.pdf
    • http://klconsultantsinc.com/uploads/1/3/0/6/130621401/4c83489581.pdf
    • http://versedapparelinc.com/uploads/1/3/0/6/130620778/3dd8bce1d22d2b.pdf
    • http://xuvet.sergi-black-rose.ru/uploads/2020/01/28/lufoxogorapik.pdf
    • http://nsuxa.net/uploads/2020/01/28/767803.pdf
    • http://podollangpis.devsite-1.com/uploads/1/3/0/6/130639949/130639949.html#biotic+factors+in+the+coniferous+forest

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000010c9.bin
77c825c7935046fe9434bd09ba8dc2686f9a7d86b7d97f2958624481bf572f58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9 7696 bytes

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