Malicious PDF — malware analysis report

Static analysis result for SHA-256 811435751d78b843…

MALICIOUS

PDF

32.0 KB Authoring application: Karbon
MD5: 1963c78e699e6cd47c365fab461bc4d1 SHA-1: f47a234d6ee0988959629ef884a03ba3ed29fc59 SHA-256: 811435751d78b8434fce3b5dd0fd4e99f9e2e9f6c6e20b69f9cccdfbd8be680e
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded URLs pointing to other PDF documents, a technique often used for SEO manipulation or to host phishing content. The ClamAV detection and ML classifier strongly indicate maliciousness. No scripts were extracted from this sample, but the link farm itself is the primary indicator of malicious intent.

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://eliteculinarychef.com/uploads/1/3/0/6/130604254/3545aa.pdf
    • http://nationalpostcards.ie/uploads/1/3/0/4/130476709/1dd91.pdf
    • http://caffiechang.com/uploads/1/3/0/6/130620793/6028167.pdf
    • http://rudywalkerofficial.com/uploads/1/3/0/6/130639580/af9052c2d1becf0.pdf
    • http://yayaskitchen.net/uploads/1/3/0/4/130435518/kefalorijavenaxerig.pdf
    • http://mistersac.com/uploads/1/3/0/7/130775704/fb9d9ebe6d53.pdf
    • http://serenielle.com/uploads/1/3/0/7/130775672/fuwesu.pdf
    • http://hostmaster.raspberryhair.co.uk/uploads/1/3/0/6/130604958/5585318.pdf
    • http://aprilcable.org/uploads/1/3/0/7/130739878/665395.pdf
    • http://onlinemarketingmastermindgroup.com/uploads/1/3/0/6/130639539/kuxifusaledebenemem.pdf
    • http://wcd-1199sab5.mgh-r.ch/uploads/1/3/0/5/130550836/130550836.html#descriptive+correlational+design+method

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002974.bin
4cdae39937bb15f9e5683b51d26e5ea205bcbb36de128d8b51ed46bdf998057b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2974 7052 bytes

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