Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ec7b2fabfeda956…

MALICIOUS

PDF

81.5 KB Created: 2021-09-19 23:47:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 964408e0a29c5e47017c9db7630d46b7 SHA-1: 3eec690275ebf2bea376591066b8599083de15ff SHA-256: 5ec7b2fabfeda95665c9b0c94114eb160718f8b737ea2838f22864f796755d9a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a high number of embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the PDF structure and numerous external links point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://irlanc.ru/uplcv?utm_term=pdf+creator+free+download+for+pc PDF link annotation
    • https://sklepbonus.eu/userfiles/file/20246421908.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/65563230938.pdfIn PDF document text
    • http://noithatphathuy.com/Images_upload/files/74960454875.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/81891893694.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/97168392500.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/zafesapumop.pdfIn PDF document text
    • https://wsbtitan.com/images/file/demekakiref.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210919225004_jnwu7c.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/31057073658.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/383695657.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/1126556301613594235fbea.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/xopitema.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/35135413249.pdfIn PDF document text
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/42993078129.pdfIn PDF document text
    • https://www.nickelmarket.co.za/includes/ckfinder/userfiles/files/19595684328.pdfIn PDF document text
    • http://venkateshservices.com/uploads/94039052224.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/42285418656.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/kegajorugorigowomafe.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/4524243124.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/73826114803.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/49039069489.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/95707511811.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/moduse.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_off0000d9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EE 10440 bytes
SHA-256: 8376795d53b3338550c6a863dea6384ad168d8072bbbbcab35687789dfaa936d
font_01_sfnt_off0000f1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CE 17732 bytes
SHA-256: c887163c03bfacefa12af2b9666b9c048c2d628b97984557f7b818bd1570067a
font_02_sfnt_off00011fd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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