Malicious PDF — malware analysis report

Static analysis result for SHA-256 b03841f77df5de58…

MALICIOUS

PDF

40.8 KB Authoring application: Poppler-utils
MD5: b09ae6c1ef4bb91e128f13ba4e63785c SHA-1: ba5c17f64effaf4bc93d83b53759f7f7a1683724 SHA-256: b03841f77df5de586f4231a467c4a92a4fde82f219a234d7bb90e8e428690e25
150 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. The primary attack pattern observed is a 'link farm' containing numerous external URLs, likely intended for SEO manipulation or to redirect users to malicious content. No scripts were extracted from this sample, limiting the ability to determine specific payload delivery mechanisms.

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://petstylz.com/uploads/1/3/0/2/130287289/3576368.pdf
    • http://nickidenicki.com/uploads/1/3/0/2/130287852/aa053e3.pdf
    • http://xanoj.cardesign.su/uploads/2020/01/28/9747045.pdf
    • http://lpmti.com/uploads/2020/01/28/wedubowigoxewosabufi.pdf
    • http://cannabisrunvt.com/uploads/1/3/0/6/130604657/donukolunofopofifupe.pdf
    • http://mmedicalgroup.net/uploads/1/3/0/5/130589191/kowumewomukuro.pdf
    • http://misfotografie.de/uploads/1/3/0/6/130639326/5a49c.pdf
    • http://idokhvshop.ru/uploads/2020/01/28/8123842.pdf
    • http://micheldufort.com/uploads/1/3/0/4/130488583/wowato_mipeduwujog_gifusidadeluzoz.pdf
    • http://navigatelifetransitions.com/uploads/1/3/0/4/130493968/a8f168c65524d.pdf
    • http://alloexo.info/uploads/1/3/0/6/130604823/vitaf_dewapi_fariruxudi_vaveg.pdf
    • http://musicmash.ca/uploads/1/3/0/4/130483210/zojofatap-vezepufonen.pdf
    • http://seizediem.com/uploads/1/3/0/7/130776852/130776852.html#cover+letter+examples+for+preschool+teachers

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000133c.bin
6fdccefd1f4603e268b144c4fab0879c07074792bd82287e51d61a3088860994		 pdf-font-stream PDF embedded font (sfnt) at offset 0x133C 8692 bytes

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