Malicious PDF — malware analysis report

Static analysis result for SHA-256 43486dd29f6f2cc5…

MALICIOUS

PDF

36.0 KB Authoring application: LibreOffice
MD5: fe585b793925a7f88d890c156c8fcfdc SHA-1: db385d3ddaf1eaced6567284c396cae8547e70b2 SHA-256: 43486dd29f6f2cc5b640e02035a05a4157c61ed5c95a84716559be316a2da44d
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF file contains a large number of embedded links to other PDF files, a technique commonly used for SEO poisoning and phishing. The document body, presented as a graduate school reference letter, is a lure to encourage users to click on these links. The ClamAV detection 'Pdf.Phishing.TtraffRobotInstall-7605656-0' further supports the phishing and malicious download intent.

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://pilatesandyogawithsharon.com/uploads/1/3/0/5/130590672/sasuminenuzorap.pdf
    • http://oliviawinter.net/uploads/1/3/0/5/130551935/sagewopaxemojop.pdf
    • http://zhangxiaoyan.info/uploads/1/3/0/6/130605179/kesafusuwesafad.pdf
    • http://rwandalawoffice.com/uploads/1/3/0/3/130313339/kobaka.pdf
    • http://cosy-home.org/uploads/1/3/0/4/130489418/rolofomipomiwom-makusobomupoz-wodaz-fopijusa.pdf
    • http://myroyaltonwedding.com/uploads/1/3/0/4/130436213/7947190.pdf
    • http://torranceheating.net/uploads/1/3/0/6/130620305/8017698.pdf
    • http://mego.0706shpps05.fun/uploads/2020/01/28/jijaxufojow-kinibuda-kibalubifuzu.pdf
    • http://nolimitationsyouthservices.org/uploads/1/3/0/4/130435514/xeduguzikiw.pdf
    • http://metalmorphicrv.com/uploads/1/3/0/5/130588964/wowabupovadubelew.pdf
    • http://meredithbirrell.com/uploads/1/3/0/7/130738596/130738596.html#reference+letter+for+grad+school+example

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000125f.bin
82cacad8cb69acd5481631c43f9ce99664e9d8a1facc07c82a0730dd5effb29a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125F 7196 bytes

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