Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bf5657c5cc97ed9…

MALICIOUS

PDF

37.5 KB Authoring application: Poppler-utils
MD5: d8f1f049e62c74914dd4072ac9e438ea SHA-1: f8775a8d1c5e6ccd0935323440ea1458c7413f82 SHA-256: 8bf5657c5cc97ed9cca154f2848c9c16712cbe9e354018dd14b25d8e61a01db1
150 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing a large number of external links, specifically pointing to the domain 'mynorthstarcares.com'. This indicates a likely SEO manipulation or link farm tactic. The ClamAV detection as 'Pdf.Phishing.TtraffRobotInstall-7605656-0' further supports a malicious classification. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

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://mynorthstarcares.com/uploads/1/3/0/4/130483294/viwokilokedagok_takegibebegejud.pdf
    • https://wexozigufujered.weebly.com/uploads/1/3/0/5/130539059/vuzun.pdf
    • http://nadi-haas.de/uploads/1/3/0/6/130603704/15481809c5.pdf
    • http://tarigolaw.com/uploads/1/3/0/6/130621363/lujusirokiteki.pdf
    • http://carlinnguyen.com/uploads/1/3/0/6/130604315/wugupapobilabesedi.pdf
    • http://wendyohlendorf.com/uploads/1/3/0/4/130436390/4ec285baf3269.pdf
    • http://datumimpact.com/uploads/1/3/0/5/130588839/f72aec04.pdf
    • http://menigev.kformacion.com/uploads/2020/01/28/42ad516f4702.pdf
    • http://cmajor7music.com/uploads/1/3/0/5/130588487/dc23659100a4.pdf
    • http://puppylovepetcarema.com/uploads/1/3/0/5/130546183/legazabi_bedifan.pdf
    • http://nashobavalleyextractco.com/uploads/1/3/0/6/130604104/130604104.html#1st+grade+printable+reading+comprehension+worksheets

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001433.bin
963044df39cb4bb709e4fa5341594dcd8f5edc6e81b28e2ed62ef8a7fbfb8fb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1433 7700 bytes

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