Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0db7aba829f4df8…

MALICIOUS

PDF

38.4 KB Authoring application: Karbon
MD5: fb4fabbb401fbbc5893d6701ce6297d4 SHA-1: b973d0e812eebc71e7697870cf78e45978f5db9d SHA-256: f0db7aba829f4df8a30bdad796aaa840ee8b52692e1953347a64bab5f925dd7e
150 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or distribution network. ClamAV detected this as 'Pdf.Phishing.TtraffRobotInstall-7605656-0', and a machine learning classifier assigned a high probability of maliciousness. The embedded document body text, though heavily obfuscated, appears to be a lure related to 'Abraham maslow self esteem theory'. The primary attack pattern involves directing users to a network of external resources.

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://nicholebertucci.com/uploads/1/3/0/3/130379354/4e50829350.pdf
    • http://dashielllaw.com/uploads/1/3/0/5/130538946/zorunulilow.pdf
    • http://camsexboys.com/uploads/1/3/0/6/130604637/xojelulobu.pdf
    • http://insideunderwear.com/uploads/1/3/0/4/130489499/ruvaxa.pdf
    • http://myrichardsonrealty.com/uploads/1/3/0/4/130476309/musepirumutebo.pdf
    • http://pugetsoundbfw.com/uploads/1/3/0/6/130605017/nepunovatitasuramu.pdf
    • http://ex-tempore.net/uploads/1/3/0/5/130589302/1029946.pdf
    • http://ofnol.com/uploads/1/3/0/6/130621719/9540b254.pdf
    • http://chiccityhippieheartproductions.com/uploads/1/3/0/5/130551991/fe2120a77829f.pdf
    • http://nhabatdongsan.com/uploads/1/3/0/8/130814197/fivuk.pdf
    • http://richcarpetcleaning.net/uploads/1/3/0/5/130590051/ferukebolex.pdf
    • http://o9hf0.bpmtc.com/uploads/1/3/0/8/130813769/130813769.html#abraham+maslow+self+esteem+theory

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003f4d.bin
a7d2664ea8ee9edba2f554f9009223bcc62709c269e89247d409f14e9581adbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3F4D 8012 bytes

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