Malicious PDF — malware analysis report

Static analysis result for SHA-256 91cd13c7b7126f90…

MALICIOUS

PDF

44.0 KB Authoring application: PDFedit
MD5: c14e4c3e29b92efe65012751470aace5 SHA-1: cee2ec02e610bdcf295e7ec63065035da597c9de SHA-256: 91cd13c7b7126f9009a1a67a48b0cfff8415c702671801945289b6e0d39d9fc6
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, a technique often used for SEO manipulation or to distribute malicious payloads. The ClamAV detection as 'Pdf.Phishing.TtraffRobotInstall-7605656-0' and the ML classifier output strongly indicate malicious intent. The embedded document body text, though heavily corrupted, mentions 'animals worksheet' and 'nursery rhyme', suggesting a lure to disguise the malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://derig.host/uploads/1/3/0/3/130323235/tamefasurilaj.pdf
    • http://evantervetphotography.com/uploads/1/3/0/4/130483134/fidofubipe-ruwubigagido.pdf
    • http://3amcollage.com/uploads/1/3/0/5/130538842/5200847.pdf
    • http://dxef.com/uploads/1/3/0/2/130272247/4450531.pdf
    • http://claytonheightssportmassage.ca/uploads/1/3/0/2/130289244/e366c213cfdbc.pdf
    • http://noahcaseycounselling.com/uploads/1/3/0/3/130379492/xuzezaxevijuzuzikat.pdf
    • http://alldolledup-dollclothes.com/uploads/1/3/0/4/130436127/a60a6a9e3.pdf
    • http://trojantailgateclub.com/uploads/1/3/0/8/130814581/ropurirosutobedan.pdf
    • http://drinkresponsively.net/uploads/1/3/0/3/130313491/ditif.pdf
    • http://miaburundi.com/uploads/1/3/0/7/130775087/975384.pdf
    • http://boisebrunchbabes.com/uploads/1/3/0/7/130776535/281875b.pdf
    • http://rx4retirement.info/uploads/1/3/0/5/130551739/2704882.pdf
    • http://kitchenaidservicecenter.net/uploads/1/3/0/3/130379110/4e39982954.pdf
    • http://prophits.net/uploads/1/3/0/7/130775286/dafukiranopirabaxo.pdf
    • http://neboair.com/uploads/1/3/0/5/130551053/7334575.pdf
    • http://naturesbarnyard.com/uploads/1/3/0/6/130603721/f39002af4429c29.pdf
    • http://monsterworksmgmt.com/uploads/1/3/0/3/130323517/lopapidufes.pdf
    • http://minecraftray.site/uploads/1/3/0/7/130776646/popada.pdf
    • http://caplonsystems.com/uploads/1/3/0/5/130589004/512102.pdf
    • http://loto2019.site/uploads/1/3/0/5/130539706/lasoworikokiwiw_lijiwixexinozof_vopipanonuxuro.pdf
    • http://geeksmax.com/uploads/1/3/0/4/130490106/57a40da9.pdf
    • http://monicalarsen.net/uploads/1/3/0/5/130551140/8160576.pdf
    • http://talltowergames.com/uploads/1/3/0/2/130272420/jenezirev_busuzinoxi_tewalose_zuzexalu.pdf
    • http://friendshiprule.com/uploads/1/3/0/4/130483773/wewuzalupukobufap.pdf
    • http://svea1988.com/uploads/1/3/0/5/130539046/130539046.html#wild+and+domestic+animals+worksheet

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002e64.bin
f31c439e28d0137206b91a151f21343900f846ed9ff070250fbe82eb1cc7da1d
pdf-font-stream PDF embedded font (sfnt) at offset 0x2E64 16204 bytes
font_01_sfnt_off0000469a.bin
47a15b049c8da1719796dcd4daef584b0fd199c49c086e3ff285e82a06110aea
pdf-font-stream PDF embedded font (sfnt) at offset 0x469A 8560 bytes