Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d8d87872a4835ed…

MALICIOUS

PDF

51.1 KB Authoring application: Nitro PDF
MD5: d786f2d42f75682a4ba30be2db84d821 SHA-1: f8581f210ce2ea46d4061cf9a4ee0695a9890c2b SHA-256: 6d8d87872a4835edb1b07e80a6305ab94948f17e504e798bcc557e52c08ea912
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with most links pointing to suspicious domains hosting other PDF files. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing. The embedded URLs are likely used to redirect the user to malicious content, potentially for malware distribution or further phishing attempts.

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://jurofa.syriabay.com/uploads/2020/01/29/ziviruxebodimi.pdf
    • http://evq.ro/uploads/1/3/0/4/130488382/juvupa.pdf
    • http://materialsdesign.net/uploads/1/3/0/5/130539881/8df4698590.pdf
    • http://flabgu.com/uploads/2020/01/28/sikut_lefemawaderomix_gotonogojiko.pdf
    • http://otuextn.weebly.com/uploads/1/3/0/6/130639329/bopibijex-fafuwetanowesa-gurabigomol-monubebafok.pdf
    • http://cmillns.com/uploads/1/3/0/6/130620645/d09eab5029fd0.pdf
    • http://afaparents.org/uploads/1/3/0/4/130476368/130476368.html#painting+quote+template+pdf
    • 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_off00001113.bin
a47b30a5c4d80999c784fb877cd230bfc78b41af5516482650823b183a25b8b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1113 8144 bytes
font_01_sfnt_off00008275.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8275 16036 bytes

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