Malicious PDF — malware analysis report

Static analysis result for SHA-256 b767319e7d4675f6…

MALICIOUS

PDF

30.0 KB Authoring application: Nitro PDF
MD5: 04bce04a15118b050a4d9d552c04c4c9 SHA-1: acb99a481c04c0529a7b5a0187ff549c55d412a1 SHA-256: b767319e7d4675f68239f9507bd616bdeb34c32d59451a54c5470ac4b055564e
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded external links, a technique often used for SEO poisoning or to direct users to malicious websites. The ClamAV detection 'Pdf.Phishing.TtraffRobotInstall-7605656-0' and the ML classifier output strongly indicate malicious intent, likely phishing or traffic redirection. The document body, though heavily obfuscated, contains references to 'Lymphatic system and immunity review worksheet answers' and Study.com, suggesting a lure to a fake educational resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://jobaketu.weebly.com/uploads/1/3/0/2/130271090/mokab_mugivuf_togapukosalotum_nalujekeka.pdf
    • http://syneride.com/uploads/1/3/0/2/130289703/jaxadejorilipazog.pdf
    • http://mudhookbc.com/uploads/1/3/0/3/130323471/fogoxapupig.pdf
    • http://326project.com/uploads/1/3/0/6/130603818/buzub.pdf
    • http://montanahollidayglass.com/uploads/1/3/0/5/130588688/dd42ceb157cdaf5.pdf
    • http://nathannegri.com/uploads/1/3/0/4/130491253/bimegiroj_pogotogo.pdf
    • http://miracleinabucket.com/uploads/1/3/0/5/130588849/130588849.html#lymphatic+system+and+immunity+review+worksheet+answers

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001112.bin
610740a63e1f83d14a5a35b90e56a42abc26f6c58edac472e84ef38d7b6b6898		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1112 8172 bytes

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