Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6b72bb90f2b3cd2…

MALICIOUS

PDF

82.7 KB Created: 2021-09-21 05:07:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 290a58fbf42e5835afb26c004e9275db SHA-1: a4b80f73f6df3cef94bd81b00b0855c4f50872b6 SHA-256: e6b72bb90f2b3cd2a099c909bc1a424b98d9922e58ad2217c6685e206a1564ff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous embedded URLs suggest the document is designed to redirect users to potentially harmful external sites, possibly for phishing or malware distribution. No scripts were extracted, but the overall structure points to a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://dienlanhtruongson.com/upload/files/puvijavufuzetojafixaj.pdf In PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/mozasasagogedepaxegufita.pdfIn PDF document text
    • http://cee1968.com/ckfinder/userfiles/files/kamekegilogigovositujobo.pdfIn PDF document text
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210910104946.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210914094953.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/11489492845.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/73470736412.pdfIn PDF document text
    • http://dyccpharma.com/upload/files/57797779064.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/razetupuraduw.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6646edb93---31613855903.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202109041057199297.pdfIn PDF document text
    • https://beamstraffic.com/amb/userfiles/file/839020739.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/92314055795.pdfIn PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/15310490116.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/mufev.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/81845822944.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/tobeti.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/tuzomelomorugejatuzewivaz.pdfIn PDF document text
    • http://sireny.net/share/files/16118080946.pdfIn PDF document text
    • http://champagne-ardenne.annuaire-regional.com/ckfinder/userfiles/files/13888109143.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/retewabewib.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/jewetosijesopabalesi.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/1c6bd1d59d1ec0329f16f2402b3439e4/81304998567.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/17648888710.pdfIn PDF document text
    • http://radecznica.pl/userfiles/file/85577450437.pdfIn PDF document text
    • http://agama-rc.com/upload/files/pivevufitipu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=new+cat+d7+dozerPDF 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_off0000e257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE257 16832 bytes
SHA-256: 18b13d3c690c06db07804194b74bc5fa8861faa350f140750c50b9c869e29d4d
font_01_sfnt_off00010dec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEC 10124 bytes
SHA-256: c06f10a7480853f32b366d31fd6f77c5e97672b2095f2406706eef8616211f6e
font_02_sfnt_off000124d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1