Malicious PDF — malware analysis report

Static analysis result for SHA-256 e03dd8a86a9dae22…

MALICIOUS

PDF

78.2 KB Created: 2021-09-15 14:15:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ff4e0860c4261c503ad2a16fe16d22a1 SHA-1: db219828d6b5b8903a3093626c30eb0c195dd3e8 SHA-256: e03dd8a86a9dae22c64f6072b582930a7ed780b8922051619c2216b894ecc193
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, with one heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a compromised site for phishing or further malware delivery. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://serextion2006.com/js/upload/files/18917573436.pdf In PDF document text
    • https://daquin-ferriere.fr/userfiles/file/82014104554.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/wapupekatonabeloxukopat.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/bezofarewaxedov.pdfIn PDF document text
    • https://livermore.com/wysiwygfiles/file/jutadogugav.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/66264020258.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/molumeloborurolakelop.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/52844720886.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/61340510774.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/zudumodavawotuxixitulomiw.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/17777050223.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/10822538057.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/71826303293.pdfIn PDF document text
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/51819551484.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/5813640444.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/sodafikegiwos.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/juxeresomi.pdfIn PDF document text
    • https://spyboarcams.com/files/muvux.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/mawaxomotixe.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/tiwimemirupeduwoxotew.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/pelodapalapujevomevas.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/worif.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/nurite.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=rise+of+legend+full+movie+in+englishPDF 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_off0000c567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC567 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD79 20360 bytes
SHA-256: 71ced4272bcb8460f6a96094a76f8f9bda922f3642abaaaf486e8233c79fa59f
font_02_sfnt_off000112d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D3 10652 bytes
SHA-256: 9401254eb094df28952ac7e76e86061380ade0be199bd630587ca0a24f2300a1

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