Malicious PDF — malware analysis report

Static analysis result for SHA-256 a36d67244ba38210…

MALICIOUS

PDF

31.0 KB Authoring application: pdf-parser
MD5: afc5e83ec304d2e1797091fd3ef03ed0 SHA-1: 1fd7ec16cc10f9f804e7db19f9eb95e55fe95caa SHA-256: a36d67244ba38210282c42f66f15815404d4f69b29b0b4f98ebeacc97d8cf14e
150 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains. This behavior is indicative of a link farm designed to redirect users to potentially malicious content, as flagged by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection further support its malicious nature, classifying it as phishing-related malware.

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://springbrookaerospace.com/uploads/1/3/0/5/130589396/mibijololasupob.pdf
    • http://storeoutsideyourdoor.com/uploads/1/3/0/5/130588297/junotokukoka.pdf
    • http://nanomat2018.com/uploads/1/3/0/6/130621412/1306476.pdf
    • http://lehighvalleybarbell.com/uploads/1/3/0/3/130313391/zamubos-zufivaxu-gopunigezu-xijode.pdf
    • http://dianebrowncolourspecialist.com/uploads/1/3/0/5/130547624/5cacf.pdf
    • http://thefirsttimes.com/uploads/1/3/0/6/130604213/komos.pdf
    • http://vixenpromakeup.com/uploads/1/3/0/4/130476760/3883022.pdf
    • http://natinelflowerslinensandrentals.com/uploads/1/3/0/5/130589151/882c3f62ae831.pdf
    • http://nativitybloomingtonparish.org/uploads/1/3/0/6/130605161/poripedoroli.pdf
    • http://moonmountainsonoma.com/uploads/1/3/0/7/130738623/664301.pdf
    • http://nickumelectric.com/uploads/1/3/0/2/130288729/7286409.pdf
    • http://3505brunell.com/uploads/1/3/0/6/130621546/buwamarunimuw-zetubavatonutus-welojako.pdf
    • http://thecottonshops.com/uploads/1/3/0/6/130639476/5c5331fc6.pdf
    • http://sauerlandhypotheek.nl/uploads/1/3/0/6/130621137/130621137.html#differential+diagnosis+for+post+streptococcal+glomerulonephritis

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001763.bin
6dc6e07f93ae70488a19e8a398a1c6cda2f5723fc3d3cbe180c5afbb10c3611e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1763 2864 bytes
font_01_sfnt_off00002344.bin
9e85ac237792fbaa8153506cd764881a9ac64f5a2e02cb9a405e63dfe4198832		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2344 6548 bytes

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