Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaff50cc6db3bc6e…

MALICIOUS

PDF

77.5 KB Created: 2021-09-14 11:44:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e4e77ec48278ee95b3dc7c24f5ee3911 SHA-1: 41ed6cf558df1614b512e08cf11e09d760a61c3a SHA-256: eaff50cc6db3bc6ee646c205af77a8224b2877d4971a7c89edd8122d8a2f1b40
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting, indicating a link farm designed to redirect users to potentially harmful sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=the+umbrella+academy+pdf+espa%C3%B1ol PDF link annotation
    • https://alnahamgroup.com/userfiles/file/72361831996.pdfIn PDF document text
    • https://helices-evra.com/userfiles/file/zipatiniwaximeno.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/58181489877.pdfIn PDF document text
    • http://eko-uklid.com/files/file/mowopijubesarawifuzog.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210906_205353.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/27514094136.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/14749186673.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/somejuxem.pdfIn PDF document text
    • http://baoveantam.info/upload/files/13370529357.pdfIn PDF document text
    • http://ewtch.com/upload/files/40926937693.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/pipujazerevazozal.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/tebawilolusimonajoginoton.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/kakelelajikaxozuxow.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/36118703439.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/6188580956.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/d4oi6tgfl9kef952255tohcmp4/roboguzegatovoxa.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613560536617e---mowulematitavakitopupaze.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/bolexipikovitefijuwoga.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/rojutesizijowewor.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/47439507772.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/favudejakuvigufiwoka.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/foxewukof.pdfIn PDF document text
    • http://ippon.lv/uploads/File/jesamawones.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/zevuvusidega.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/ginavarerufa.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_off0000c540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC540 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD52 18376 bytes
SHA-256: ad72c7082358db8e4ecffc404d08cf6d0b6bf76f6d841861f09f6e8aa0e55226
font_02_sfnt_off00010ca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA7 11112 bytes
SHA-256: d710a54807ed1da1d55b85da7fb90322888854b242e73db94bce99ea75d6e4d6