Malicious PDF — malware analysis report

Static analysis result for SHA-256 50ab0527fa55d3d8…

MALICIOUS

PDF

62.6 KB Created: 2021-09-26 21:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 105408d4873342befc9b0f059065d0e8 SHA-1: 8784c7a085657b0f901fc23a1310cd3727ddf97e SHA-256: 50ab0527fa55d3d8f83fc6708039ab1a081f4ed86b77c6662848ed213c9ac10b
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The sample also exhibits characteristics of a link farm, with numerous external URIs pointing to potentially malicious content. The ClamAV detection and ML classifier further support its malicious nature, indicating it likely serves as a lure to download further payloads or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5746

Heuristics 5

  • 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
  • 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://american-security-inc.com/assets/ckfinder/userfiles/files/54976413397.pdf
    • http://denis-lefebvre-services.com/fichiers/file/29074195819.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/c869d458a527a887831c5ed826d7ee68/bukale.pdf
    • http://pluimveebeurs.com/userfiles/file/mimolozub.pdf
    • http://abovomedia.hu/_user/file/92822338951.pdf
    • http://clubesquilacoma.com/uploads/files/lobofenanu.pdf
    • http://healingtown.org/userData/board/file/doxozotumogikiw.pdf
    • http://9meclinic.com/ckfinder/userfiles/files/gidijupusasolategakikesa.pdf
    • http://cyc.cz/pictures/clanky/files/57154091588.pdf
    • http://dade666.com/userfiles/202109file/2021091302234770554.pdf
    • http://microsolder.hu/userfiles/files/16792189655.pdf
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/pukepegusagaruve.pdf
    • http://mitcostruttori.it/userfiles/files/mumajasomomuwa.pdf
    • http://ssatripoli.org/userfiles/file/11867987937.pdf
    • https://hoavily.com/uploads/files/74630068696.pdf
    • http://citty.org/images/uploads/file/gitimebejoxixowokerif.pdf
    • https://tortugafilms.ca/adminfiles/file/12112283075.pdf
    • http://getampedmag.com/ckfinder/userfiles/files/kafisagafake.pdf
    • http://mobiliteit.nu/files/reniwosotakizokuberowal.pdf
    • http://ventss.ru/userfiles/files/56901854308.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/161426ff403b01---baxikut.pdf
    • http://autosoftware.company/autoresponders_images/files/gowunajop.pdf
    • http://tianlanlawyer.com/filespath/files/20210921081152.pdf
    • https://koratspring.com/upload/file/zugejo.pdf
    • http://co-mit.com/uploads/files/xegodu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=android+turn+off+voicemail
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3bf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3BF 16792 bytes
font_01_sfnt_off0000cbd6.bin
63c7e03bc0c379426f305f8e0212b7a29a16dc5dc088d11968d0cceb54ae6c9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD6 10616 bytes

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