Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7da8d25d444b2e3…

MALICIOUS

PDF

87.8 KB Created: 2021-09-10 01:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a5bf78d8dfadc6362f780ad034d37cbd SHA-1: 10123f522a6b76e51902807539fd92740102ae30 SHA-256: f7da8d25d444b2e3c3e3c932111a474f524f0680d0fe2eb762f2fca92a63d663
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript 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 a link farm or phishing attempt, aiming to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://ecohort.com/userfiles/files/valemurolideruworaf.pdf In PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/92791141891.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/perozowurixupipir.pdfIn PDF document text
    • http://rc-modeller.se/images/file///lozodewitokurivanutajiv.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/34053598825.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/6761658720.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/60398145595.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/wapokotuvabiwesanimuba.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/ripovevusazofebovatove.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/tutaliforabobasonakomalof.pdfIn PDF document text
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/gaxukogenojiwonesijakago.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/papomevebuxelebu.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a81fb1efa4---kulodobefagalelobuzom.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/bewijeridenuritexuzu.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/3161580408.pdfIn PDF document text
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/vofogexiwa.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/sejukikoguzudevoviloni.pdfIn PDF document text
    • https://oceanflowerhotel.com/uploads/image/files/xezagugafaketat.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/6071403451.pdfIn PDF document text
    • http://master-vin.ru/files/file/31112030996.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/86267558752.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/rabegezirunosolajis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=french+adjectives+starting+with+ePDF 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_off0000e9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B4 22044 bytes
SHA-256: 7192cf65d153b69d2d0317ca7e11778dd6b454571b00c164015245428b2429d1
font_01_sfnt_off0001215c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1215C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13973 10740 bytes
SHA-256: 2bbf339674822a0c2dbd66bf617d6e7bcafa7dd2c83619091cabfe2147e468a9