Malicious PDF — malware analysis report

Static analysis result for SHA-256 68ddf7ee3d9d4e43…

MALICIOUS

PDF

48.9 KB Authoring application: Adobe PDF Library 9.0
MD5: e950b13631d45a4b6cafa77248bd874c SHA-1: 39304c38560359b7b6674fe928dbfb6d13ededdc SHA-256: 68ddf7ee3d9d4e435718aefd6c1357aba3dc507a2d34567946ce7aaed3da9a8f
152 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, masquerading as a grammar textbook answer key, which is a common lure for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, likely involving the distribution of further malicious content via the embedded URLs. No scripts were extracted, but the structure suggests a link farm designed to redirect users to malicious sites.

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://mishevski.de/uploads/1/3/0/6/130620353/fasigopimuri.pdf
    • http://cprstars.org/uploads/1/3/0/6/130621663/9632009.pdf
    • http://prathamut.org/uploads/1/3/0/6/130639860/3852960.pdf
    • http://solarenergybrokerinc.com/uploads/1/3/0/5/130588426/8806475.pdf
    • http://glorydaysmagazine.com/uploads/1/3/0/4/130483457/donotalule.pdf
    • http://nursinghomelawyeradvice.com/uploads/1/3/0/7/130776735/pijazenifev_pokanesebutoz_pudizifebeba.pdf
    • http://birrddy.com/uploads/1/3/0/6/130604369/1be5d3f7.pdf
    • http://buy-consoles.com/uploads/1/3/0/8/130874543/130874543.html#fundamental+of+english+grammar+third+edition+answer+key
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000618c.bin
c6833c841f46b728c433182c6a1d4f9349cf525430e3291f03d07668c04481c5		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x618C 27284 bytes
font_00_sfnt_off000011a4.bin
77cfdd6946c8df1eef4b6a936f24d64bdba39d787aab1e7581bd313f019c5e9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4 8604 bytes

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