Malicious PDF — malware analysis report

Static analysis result for SHA-256 6122855982675509…

MALICIOUS

PDF

39.2 KB Authoring application: Pdftk
MD5: fa0d78d66dbb851c1dd5ae88286d1d3b SHA-1: 4b05d6d07887c536b56263c614fcf43253a35356 SHA-256: 6122855982675509bfa8e2ab5a7575646a51dde2db5e471c92ab93736ad4ddd3
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links to other PDF files, masquerading as TOEFL Junior mock tests. This behavior is indicative of a link farm designed to distribute malicious content or conduct phishing. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

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://charlesheiner.net/uploads/1/3/0/4/130493143/pajalolowupezar.pdf
    • http://805guru.com/uploads/1/3/0/8/130813852/remufu_duvolisez_vokado.pdf
    • http://www.mindmeetscanvas.com/uploads/1/3/0/6/130604203/beduxekizoko.pdf
    • http://revelationsmagazine.com/uploads/1/3/0/4/130483842/kigagapiw.pdf
    • http://ftp.annabelgreen.com/uploads/1/3/0/6/130639669/wujunona.pdf
    • http://metrointegrativesupplements.com/uploads/1/3/0/7/130775729/955c0b4.pdf
    • http://simplyfabricated.com/uploads/1/3/0/5/130589131/sifamunun.pdf
    • http://teachertrainingforyoga.com/uploads/1/3/0/8/130874670/wazumebawexozo-noxes.pdf
    • http://midwest-grow.com/uploads/1/3/0/5/130538990/zinexilumimoguj-batumebav-disuwido.pdf
    • http://www.oaktreenetwork.com/uploads/1/3/0/7/130776114/5693653.pdf
    • http://craniosacralnashville.com/uploads/1/3/0/6/130604078/130604078.html#toefl+junior+mock+test+pdf

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000041c9.bin
f05e20f4aed81ebcbf2bdfe075ab25c579efc2c70ca61b9ab4bfa5bee54b4da3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x41C9 8556 bytes

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