Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a3f728ce58e07ac…

MALICIOUS

PDF

69.3 KB Created: 2021-09-19 04:31:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6bbbcc6e8dcc263185bb10f34b3b3273 SHA-1: aacf71ce7cbc3dfcdf38db4fb003a2962847c900 SHA-256: 3a3f728ce58e07acdd1295f50f7723a7665401a200e18b6ebd1f2a692a21755a
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. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://allytemp.ru/uplcv?utm_term=top+grossing+play+store PDF link annotation
    • http://coyada.com/up_images/up_images/tojetojawibapejimowugif.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/zobabevekedor.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/96262223691.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/11949299870.pdfIn PDF document text
    • http://mopron.ru/upload/files/986065826.pdfIn PDF document text
    • https://bursac.net/userfiles/file/lopon.pdfIn PDF document text
    • http://e5tbr.alruaa.com/ckeditor-ckfinder-integration/uploads/files/dedax.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161424fdac1696---42949294624.pdfIn PDF document text
    • https://mihalex.by/files/files/pevelomuneber.pdfIn PDF document text
    • http://tjtvina.com/Upload/files/52187346993.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/zenavoseduvemomuzupiwupo.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/bakaseza.pdfIn PDF document text
    • https://vzglavniki.net/data/file/tutevidutem.pdfIn PDF document text
    • https://morabia.fi/images/file/fanijudizesututubedon.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/57663275437.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/46473108344.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/23331057626.pdfIn PDF document text
    • https://interconformity.ro/images/file/baxoluke.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/57929805385.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/tomivelekunezojaze.pdfIn PDF document text
    • http://crystaltrade.hu/data/file/56450488662.pdfIn PDF document text
    • http://mamam.by/upload/File/file/bigok.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/45042277055.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/ziridilofuwuzisadokexon.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/37590851261.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/iipcmglcrs6jhnkcp1flu7ioq4/pabezuxevuneridubepisa.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_off0000b210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB210 10504 bytes
SHA-256: 82bb9eb3fa679200dde9cfe8a27b8e6344a24e621c27b2ef97a10b050a5b16b3
font_01_sfnt_off0000ca19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA19 14992 bytes
SHA-256: 4ac4c03ef2ee827863ffc0846fb51a3c8bf6097e0ea6d9d14d31f696295ca39d
font_02_sfnt_off0000efbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1