Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ebed251a0e329b3…

MALICIOUS

PDF

60.9 KB Created: 2021-09-21 21:25:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a83bdddf0cad64c0147b92c2f60c73af SHA-1: 2339d460d1badba6513bac134898d242472588bc SHA-256: 9ebed251a0e329b301e1199859454f62be609bd352dff2d59bc791b9832bf83c
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to disposable domains, and a heuristic identified it as a link farm. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple unknown reputation URLs suggests a campaign leveraging these domains for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7898

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://cokhitienvuong.com/uploads/files/lulasago.pdf In PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/lonavijevawizulutodani.pdfIn PDF document text
    • https://akconta.com/uploads/files/wolerepalu.pdfIn PDF document text
    • http://nbc.com.vn/ckfinder/userfiles/files/15686699537.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/2348357856.pdfIn PDF document text
    • http://dinhviht.com/images/newtech/files/sizulatapunoxaliviz.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/balubulalukitenufebalij.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/pasukazawufepuloki.pdfIn PDF document text
    • https://cape-electronics.com/media/file/zodonulegobotakerevipodax.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/32667988563.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109121434236302.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423eb9106a6---tazozilurufup.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/nojumina.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/30932723179.pdfIn PDF document text
    • https://labelmarket.pl/data/file/mosivutupasuvujon.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/18688624064.pdfIn PDF document text
    • http://sanraimundo.cl/dyn/uploads/file/setaserupuwuxodonig.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/77219756072.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/77081671929.pdfIn PDF document text
    • http://demkapi.com/resimler/files/88628851518.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/53850083989.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/bipegazinuzupujib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=gcam+for+redmi+note+8+pro+android+10PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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