Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0a4849dda2df78f…

MALICIOUS

PDF

83.2 KB Created: 2021-09-17 17:21:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7f9009003362f192a27b529306f8c106 SHA-1: 5af54426671e9f27524385d5668f9e5ab612d81c SHA-256: e0a4849dda2df78fcafa8abdcc5a3aa0f014059e9b9648810a82cb1f3db1f976
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on domains associated with link farms and disposable content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a primary indicator of malicious activity within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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 https://mysmartedu.com/uploadimages/files/15459252387.pdf In PDF document text
    • https://takarasushimn.com/userfiles/files/21607866155.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/giwulewelega.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/66188485556.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/65053014454.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/26085517033.pdfIn PDF document text
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/retisigeduj.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/46508863326.pdfIn PDF document text
    • https://halkum.rs/files/burawosabinononogoxax.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/161327e707236a---razumibakumuvafa.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/92314645938.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/1gpblblbgg9bq8u5c11ti932jh/widigunilinokijo.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/74930604128.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109140417597030.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/munasasigipimekadok.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/tubixibox.pdfIn PDF document text
    • http://euro-ex.com/images/blog/file/34644700051.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/zilidokije.pdfIn PDF document text
    • http://adice-area.com/pictures/files/tozirunovuvomofeji.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/tigexaxapavi.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/vupetuvimijosutewitafekeb.pdfIn PDF document text
    • https://alertsecurity.in/ckfinder/userfiles/files/43879886747.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/gejuxawili.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=pathways+3+reading+writing+and+critical+thinking+answer+key+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC6 11244 bytes
SHA-256: 3fd44b950b2c0d3f524b390a2f913b7f8b11b28cbcee759bff89210c233a365a
font_01_sfnt_off0000f6fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0E 18340 bytes
SHA-256: 6ef312b27f6de6f3d6f476db3727a2c14724b92290b7162a54d8071f023feef2

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