Malicious PDF — malware analysis report

Static analysis result for SHA-256 204bd734d7aa4083…

MALICIOUS

PDF

74.7 KB Created: 2021-10-01 18:24:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0adceb6567401e079005adce97557664 SHA-1: d906ea2b82c23b8249acf660b0b13c2ca1a92d5e SHA-256: 204bd734d7aa40839922ae23b3fbb22ca948eaa366e809cb1c2b1268c097b33e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also leverages a link farm with numerous external URIs, many of which point to unknown or potentially malicious domains, suggesting an attempt to redirect users to phishing or malware hosting sites. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://faithleader.org/js/ckfinder/userfiles/files/mafepajojalowag.pdf In PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/telerefilenasujona.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/90544849522.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/fuzupezukeditotufatabux.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/linodesudinirezira.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/9838acecb39a794520c52e2606453974/91518789665.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/texuxokefimisasojuneb.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/76467702814.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/xudivemimejijetawogizi.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/dobiden.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/rakenosiziluxorir.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/nozitosisolesito.pdfIn PDF document text
    • https://visualmotion.nl/uploads/file/29063317752.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142285e36b2a---suxukelefekopez.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/kafobetelesezoxelugi.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/49342451156.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/userfiles/file/57104199486.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/8360801253.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/693459586.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/wogexotaku.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/19134622224.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=the+earth+dragon+awakes+journeys+test+pdfPDF 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_off0000b824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB824 11124 bytes
SHA-256: 3b913c1e44c65007061b02bc184e7ce99990b81e2b3b1750aa920f7c99477e04
font_01_sfnt_off0000d1fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FD 18716 bytes
SHA-256: b21340581de2cee2e0b0bde429d4ffa2a03b6610775da084e2d1bff894b1d2ba
font_02_sfnt_off000102f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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