Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbb3f37981315567…

MALICIOUS

PDF

33.3 KB Authoring application: PDFedit
MD5: 9a17b65f1666d18b3b92859fc154a7e2 SHA-1: f170d84f3ccca61dddb525e190625cca4e74aa86 SHA-256: bbb3f379813155675c1cc28f56880f4734cff4b095c57409b270999c0af0afbd
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links to external PDF files, a technique often used for SEO poisoning or to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent. The document body, while containing garbled text, includes references to Angular and Adobe, potentially as lures or to appear legitimate. The primary attack pattern involves directing users to a network of linked PDF documents.

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://music4am.com/uploads/1/3/0/5/130551700/5260143.pdf
    • http://alfnevents.org/uploads/1/3/0/5/130588954/sepuvarenagapap_belani.pdf
    • http://1113studios.net/uploads/1/3/0/4/130490117/8884758.pdf
    • http://borderarte.com/uploads/1/3/0/6/130604631/370fa2fc4d1769.pdf
    • http://whiterockmedical.com/uploads/1/3/0/2/130288893/c7e3356091e47.pdf
    • http://armyvetwear.com/uploads/1/3/0/6/130604742/dikigu.pdf
    • http://lsbdacademy.com/uploads/1/3/0/6/130604273/koditiwa.pdf
    • http://mindregard.com/uploads/1/3/0/4/130488270/loxigik.pdf
    • http://fungame.pw/uploads/2020/01/28/liniwo.pdf
    • http://capitalpollinatornetwork.com/uploads/1/3/0/6/130621918/zobimivusu_wisajowulo_lurisu.pdf
    • http://2ourhealth.net/uploads/1/3/0/5/130590431/9456659.pdf
    • http://cockblockproductions.com/uploads/1/3/0/6/130604317/130604317.html#angular+7+formgroup+submitted

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000012b0.bin
a095d3b188e1050f45a4288625f4a07f5c5c1dfdbf291c8c662bcb7053caf6e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B0 8612 bytes

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