Malicious PDF — malware analysis report

Static analysis result for SHA-256 beb56855dbd8a522…

MALICIOUS

PDF

84.7 KB Created: 2021-09-20 05:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c7a2b99a0a99c45bb03fc8cc828ab675 SHA-1: 90a298a878b268ec5fb2a4e16827e378ec0a03f6 SHA-256: beb56855dbd8a522836370965dc7552bd1bef8af6e355a7b05aaebefc19e2ffb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs suggest the document is designed to redirect users to a collection of potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://netcsemege.hu/ckfinder/userfiles/files/suvevuzurog.pdf In PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210910065355.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/3879642974.pdfIn PDF document text
    • http://lovesenergy.nl/file/89412067939.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/4f3adb32vu29ps33kre7pmv05t/23125428953.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/pijuw.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/6359788786.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/77241482490.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/rugigisafoniwojevanadim.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/xozepevufumome.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/72994275582.pdfIn PDF document text
    • https://thebookonpersonaltransformation.com/FCKeditor/file/bofop.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/vamutoriwirofem.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/24867203148.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/ximesur.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/43890582057.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/kalewenap.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/41201211035.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16146d563248c2---bemirure.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/7043573311.pdfIn PDF document text
    • https://bedandbreakfastholten.nl/userfiles/file/10841368193.pdfIn PDF document text
    • https://shevian.com/images/file/tufefoduvosuwezimez.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/82608268535.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/pikafavumonivu.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/daluzikokuboxazedosano.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=first+largest+countryPDF 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_off0000e5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD8 10596 bytes
SHA-256: ed6f7f0ec923d94df26d61a8f680c7b76930819b9be195dcf53180a46ae4d379
font_02_sfnt_off00011638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11638 18052 bytes
SHA-256: a74c68acadff4e7c7b6aac043971cb3b8ed958d40462fa637180c9cff78b7435