Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3badc6fe7abea4d…

MALICIOUS

PDF

79.7 KB Created: 2021-09-15 12:38:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cbe6198447ac5ae8f3436885b63bf2e7 SHA-1: 4242c4ada0ad6b3f65dbb8e487ef8726237f1b83 SHA-256: b3badc6fe7abea4df65f454b00db9e2ddb00c8a043dcee54fe556cdf8ee4f61c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=talking+tom+for+messenger+apk PDF link annotation
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6f74af461---6759002528.pdfIn PDF document text
    • https://atrax.hr/files/novidefoledazanuwesi.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/96296012365.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/miluzuvivevutapofi.pdfIn PDF document text
    • https://sharedsynergy.com/userfiles/file/pefudusuvodaxitesipin.pdfIn PDF document text
    • http://thucancakoihikari.com/luutru/files/45307713126.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/nudabadigumow.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/kolud.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/94668455720.pdfIn PDF document text
    • http://surestegc.org/documentos/file/24697739833.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/95548093977.pdfIn PDF document text
    • https://suncables.co/images/file/kejukisezu.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/35962748329.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/voladok.pdfIn PDF document text
    • http://17njl.com/userfiles/files/medegilesexi.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/1600641418.pdfIn PDF document text
    • http://rujiahk.com/uploadfiles/file/xebudibozaxirelu.pdfIn PDF document text
    • https://mlspoland.co/files/file/24959929365.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/nofelexezedigekukopip.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/56244534397.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/vezomezi.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/mofugugufarirukir.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/fb464b0314a23a560e21d2e814ea6e46/88077493177.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_off0000d2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E6 17560 bytes
SHA-256: e3c9ec2c895a940c0c2ad7888504c9db3a62113b8ec0dab56ecebf5e5bae13f9
font_01_sfnt_off00010046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10046 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001185d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185D 10756 bytes
SHA-256: 38aa81916bc78f80d39821fd380e26d81b4e9b02cb413aab678acce234d8b7f7

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