Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdad54d6fb97567d…

MALICIOUS

PDF

79.1 KB Created: 2021-09-16 02:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ded6cf57d93ed4b1b81c359e19412296 SHA-1: 55411b546c4c087a45198be97df301838e0e7be4 SHA-256: bdad54d6fb97567d1ae371f09ceb15975d20fc2463338b8eedb1c5396bba09bd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically calls out this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 5

  • 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.
  • 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://crysiq.ru/uplcv?utm_term=how+to+watch+pay+per+view+on+firestick PDF link annotation
    • https://electroagro.es/pub/files/xobobulejupezofimewuw.pdfIn PDF document text
    • http://gkz-crimea.ru/userfiles/file/90873767229.pdfIn PDF document text
    • http://k1a.ru/images/files/file/punodajedudow.pdfIn PDF document text
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/99274584936.pdfIn PDF document text
    • https://securitydm.com/slicice/file/31355776479.pdfIn PDF document text
    • http://modero.vn/upload/files/sukipijanemeg.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f070a0af46---80201442402.pdfIn PDF document text
    • http://torgoborud.org/images/file/logido.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/83450324763.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/71639284636.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/7836156081.pdfIn PDF document text
    • https://mackbeks.com/files/file/34410691267.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/muxiwekibepavepega.pdfIn PDF document text
    • http://elverum-revmatiker.no/images/file/98369116927.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/10975806117.pdfIn PDF document text
    • https://delta-relay.be/userfiles/file/91844263438.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/52605796727.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/xomovozibisozizugi.pdfIn PDF document text
    • http://kasand.com/userfiles/losivum.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/wejawinemulaboj.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/kivedenitumawun.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/xivut.pdfIn PDF document text
    • http://simonide.org/userfiles/file/95614699608.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_off0000cc4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE460 18820 bytes
SHA-256: 0506160d858d7db54d7ddc34d9429291ad44c2f2a8436ef491c2f9692b416597
font_02_sfnt_off00011584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11584 10880 bytes
SHA-256: 6d8331b539cbaae0e07f03cf58d1094e4a3181d69dd9c1cf6bbfdf4028ed0cb3

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