Malicious PDF — malware analysis report

Static analysis result for SHA-256 836b25ea509fd251…

MALICIOUS

PDF

40.7 KB Authoring application: OpenOffice.org
MD5: f1af4551a204715a18372ca04d7536ac SHA-1: 7d21d62a5022a11c7732289d0fe14f6c6d3cb7b9 SHA-256: 836b25ea509fd251a44ee157c7f09f17aec402a370d796160f97025bbea88a88
150 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on newly registered domains and appear to be part of a link farm designed to improve search engine ranking for malicious content. The document body mentions 'Gillamoor primary school ofsted report', likely a lure to entice users to click on the embedded malicious links. The ClamAV detection 'Pdf.Phishing.TtraffRobotInstall-7605656-0' further supports the phishing and traffic redirection nature of this file.

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://epsaofficial.eu/uploads/1/3/0/6/130621964/1b3344f7005.pdf
    • http://limitlesslawnsprinklers.com/uploads/1/3/0/6/130604877/5647434.pdf
    • http://mhi-hoa.com/uploads/1/3/0/3/130313468/ecb71cf6da7a.pdf
    • http://moggiethecat.com/uploads/1/3/0/6/130604117/vabuwiwisigiworugu.pdf
    • http://shields-data.com/uploads/1/3/0/5/130551375/e24fbde.pdf
    • http://perfectscoremedia.com/uploads/1/3/0/5/130588607/8188198.pdf
    • http://bejustalittlebetter.com/uploads/1/3/0/6/130621818/130621818.html#gillamoor+primary+school+ofsted+report

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000112f.bin
fedc93894f5f2f98ce182a4585455b10a8613c188d829f87a01f6267ffffc3a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112F 8992 bytes

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