Malicious PDF — malware analysis report

Static analysis result for SHA-256 0389827e9d09810c…

MALICIOUS

PDF

81.9 KB Created: 2021-09-15 23:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c2672c9ff81fe044b71f20cb51b46794 SHA-1: 62779a94952663af2a62ba7ae0253b316b47a665 SHA-256: 0389827e9d09810c1cdc5e025effbe11d2a49aa1f4c198e35373fd6a2e79054f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also features a large number of external URIs, many of which point to potentially suspicious domains, suggesting a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://nemochem.cn/upload/files/guvovubugudi.pdf In PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/piwuv.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/jedoxawukixu.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/xadozubapupuvumolasoxovez.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/69964004373.pdfIn PDF document text
    • https://samowar.ch/upload/file/xegirodadife.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/a4c2a43b5998d698bf15a29c3b3cd487/besezof.pdfIn PDF document text
    • https://nepalfinepashmina.com/userfiles/file/33783958816.pdfIn PDF document text
    • http://susutour.com/userfile/file/zorelo.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/zobabalegomubo.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/gewavowanamenifuvemelu.pdfIn PDF document text
    • https://inwestorfinanse.pl/userfiles/file/64552215020.pdfIn PDF document text
    • http://industra.sk/userfiles/file/22713685205.pdfIn PDF document text
    • https://thuhuonglacquer.com/uploads/news_file/zelebipesozov.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/98916913610.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/piwaji.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210907_32CD8ABF3534FBAD.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/22452450069.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/kosusamegagamexutefurata.pdfIn PDF document text
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/daxojejirikijukutitegogap.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/80232844566.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff71fbd4a7---42210520311.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=trace+stolen+android+phonePDF 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_off0000dbc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC6 10576 bytes
SHA-256: d78ec7691ace57c2564fe8897b74259a22ab6aa417b2ce43e8ab528ea938ae4c
font_01_sfnt_off0000f3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDF 17828 bytes
SHA-256: 8191ee98347da09e3d7dbf586564b4425f0603a8cc3622812a7a4e29ad0892c1

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