Malicious PDF — malware analysis report

Static analysis result for SHA-256 f439af40b50f6156…

MALICIOUS

PDF

34.7 KB Authoring application: PDF Studio
MD5: 36a5bea8264aa5a6a52067c2fe8b4b03 SHA-1: 2856724bcdaba6c5a759cd147dcd02faf18c8fe8 SHA-256: f439af40b50f6156757822c33019521a23ab7e95ca2d77fcd458fa72315c37d1
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains a large number of external links, a technique often used for SEO poisoning or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded URLs point to a network of domains, suggesting a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://starcustomsgr.com/uploads/1/3/0/2/130274330/kufamezilezemepi.pdf
    • http://oakleafcraftshop.com/uploads/1/3/0/2/130272344/fcd2222d9e69ed.pdf
    • http://smith-re.com/uploads/1/3/0/2/130273915/4594177.pdf
    • http://nickgreen68.com/uploads/1/3/0/6/130639869/0a3fa62f59.pdf
    • http://natesdecalsandsigns.com/uploads/1/3/0/6/130604531/pufur.pdf
    • http://kentuckycaricature.com/uploads/1/3/0/5/130543239/toxusabi.pdf
    • http://l2base.info/uploads/2020/01/28/3910687.pdf
    • http://buyatpure.com/uploads/1/3/0/7/130738921/kotojexaxux-gukazasofof.pdf
    • http://seizediem.com/uploads/1/3/0/5/130546971/130546971.html#autodesk+3ds+max+2019+vray

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003272.bin
348eb119ae0d9b1b9623718794633dd530c7dd5ab514c0b7e5cf666ed71aa58d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3272 8444 bytes

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