Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fe665dccbf60bcb…

MALICIOUS

PDF

69.7 KB Created: 2021-10-04 03:24:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: cbce4293315deb5877c3427fa7af0de3 SHA-1: 33f8dc2b168b6809925ae772aa40610818aa543b SHA-256: 6fe665dccbf60bcbc1d4ee2bd92e622e8e594dac757e6baedaa3e69bc4cf30d3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by redirecting users to malicious sites. The presence of JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://cructi.ru/uplcv?utm_term=semiconductor+device+fundamentals+2nd+edition PDF link annotation
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/boneleweputi.pdfIn PDF document text
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/20055643536.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/nasanogiwixob.pdfIn PDF document text
    • http://antasboru.com/guvennet/resimlerfiles/26900311360.pdfIn PDF document text
    • http://shopcloud.cloud/ckfinder/userfiles/files/7557645802.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/lamomejopilef.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/71047419380.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/35711781263.pdfIn PDF document text
    • http://www.tecnologycenter.com/admin/uploaded/fck/file/5655688941.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/kurejenu.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/nubipi.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-10-1/20211001074652957486.pdfIn PDF document text
    • https://promoform.coreform.it/uploads/file/46717082632.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/2da23ceca3c62021c3a5329198221ca6/84646261821.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/safenonoxasulalidiwum.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/vewusijisodimuxiwefoti.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/wigufubogu.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/gosowuwosofekejolafox.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/kapofam.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/lodojatulafadago.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/46764587393.pdfIn PDF document text
    • http://foodchemsino.com/d/files/pasugidudov.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/77991707764.pdfIn PDF document text
    • 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_off0000ae6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC684 10996 bytes
SHA-256: fcbdfb6167e1151546d3fbdbb0c128563b620c5d37f88245c96d60f0619ee7b2
font_02_sfnt_off0000e01d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01D 16208 bytes
SHA-256: 16e7be475a482f3f92a9931c4f21802839e2d85f31eda3dfb33571b8a3c6a89e

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