Malicious PDF — malware analysis report

Static analysis result for SHA-256 a647497cddb818ba…

MALICIOUS

PDF

33.9 KB Authoring application: LibreOffice
MD5: 21ac9c69ac7604d7bb87dc7788353d6a SHA-1: 778b3b88512cf3b34f2fba6385e61ac2c69ceec4 SHA-256: a647497cddb818ba1d0acdbfada69093a99e6fe5e60d1a86f4fc1e5986422a9a
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, a technique often used for SEO poisoning or to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as 'Pdf.Phishing.TtraffRobotInstall-7605656-0'. The document body, though heavily corrupted, contains fragments of URLs that align with the detected link farm heuristic. The primary attack pattern involves directing users to a network of linked PDF files hosted on various domains.

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://scarletcarnival.com/uploads/1/3/0/4/130489969/javinufusumodabeni.pdf
    • http://reamerdentistry.com/uploads/1/3/0/6/130603809/4269833.pdf
    • http://dies-und-das-buntekiste.net/uploads/1/3/0/8/130874485/vuzonanasiwod-xexagoru.pdf
    • http://mrbaugher.com/uploads/1/3/0/3/130323185/142996cd4fea.pdf
    • http://kungfu-silat.net/uploads/1/3/0/2/130287289/desudil.pdf
    • http://angelinaphotography.com/uploads/1/3/0/4/130489159/902421.pdf
    • http://agl-llc.com/uploads/1/3/0/5/130551004/3fc9b5518dde1d.pdf
    • http://trileafoutdoors.com/uploads/1/3/0/7/130775033/jexakasuritovarovujo.pdf
    • http://cares3dlab.com/uploads/1/3/0/2/130287943/puvubonawim_nawurekeduf.pdf
    • http://hiltyhazzard.com/uploads/1/3/0/6/130621214/04b8961f894d.pdf
    • http://riscus.net/uploads/1/3/0/7/130739629/24729.pdf
    • http://miraclevalleyceylon.com/uploads/1/3/0/6/130603942/2821868.pdf
    • http://neverwait.life/uploads/1/3/0/5/130551750/21439.pdf
    • http://bobgruber.com/uploads/1/3/0/5/130550949/81b93684ba0f1d.pdf
    • http://ngpsychology.com/uploads/1/3/0/6/130620429/9840843.pdf
    • http://adsl-63-204-18-34.benefitplans.org/uploads/1/3/0/6/130605229/130605229.html#chestnut%27s+obstetric+anesthesia+6th+edition

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002b6b.bin
c751b141189e6aa290be50129d540978a9497034f6ddf92b8e61c3f0a358375b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2B6B 7316 bytes

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