Malicious PDF — malware analysis report

Static analysis result for SHA-256 b39378960cd6ba86…

MALICIOUS

PDF

80.5 KB Created: 2021-09-16 17:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 04eef85fca361cf8a60fa177ff024a8b SHA-1: d7214c6c4377c8b4d44376d486d1254abee37b0e SHA-256: b39378960cd6ba865a7990bcf6fe4db2f307f05cebd9d512bf469c4cf2261c99
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it's designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the idea that the PDF is part of a campaign to host many links on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://chcial.ru/uplcv?utm_term=hollywood+movie+online+streaming+free PDF link annotation
    • http://gtlitalia.com/userfiles/files/41553472841.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-13/images/files/53147746391.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/zidovomevabapabiwawip.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/zuvaxatidibevulovilokera.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/83837209784.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/sofolanadazunomok.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/judaku.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/kuvubogijumuxowesefugulo.pdfIn PDF document text
    • http://majedalkarkhi.com/pics/file/ronubezef.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/naxivogevokusewijati.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/20220682340.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/kuzinonikujutawe.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16140d82e06e11---jajaripilo.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/47470170955.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161325459b37c3---lilezuwed.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/65558499919.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/doxamufekarolikavaxujixos.pdfIn PDF document text
    • http://hoangnampte.vn/quangbasanpham/app/webroot/upload/image/files/zidegipixorufijudivi.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/43927235461.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/zeketulujumuvobipan.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/modamewinavamufowovamojus.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/41410418579.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/61432258450.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/kisibagu.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_off0000d740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD740 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF52 17272 bytes
SHA-256: 9b1007fa2e587665a462cc68771582e6f44ef33b1d7f526130040321ab9e31f7
font_02_sfnt_off00011b7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7C 10952 bytes
SHA-256: cf1f0a08a8661c5f1f6025058df39c0826094231fad88f053e6577dcbdbfaac1