Malicious PDF — malware analysis report

Static analysis result for SHA-256 b727f196974865df…

MALICIOUS

PDF

81.7 KB Created: 2021-09-19 14:34:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d9e0e2e3d8ba4020eecd02e38722d647 SHA-1: a9fa864485ef941bf3435c64273d025375a37017 SHA-256: b727f196974865df108d849ad4c7bc708244f98be2c2be935894d8fed8dc0990
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 a phishing or malware distribution campaign. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure point towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://deesudcoolingtower.com/userfiles/file/lofanikalawan.pdf In PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/fodosixajixozowedijusepe.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/36052315537.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/laxesibomuxorisuvefeso.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/rusamagijirepodivopuwev.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/daxojipadokimepe.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/b81565ad1e6ad3819d4bdb254af5ffec/3722168391.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/3281312077.pdfIn PDF document text
    • https://digitaluzaktanegitim.com/calisma2/files/uploads/tuvokuvipakirunugegid.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/jineluwi.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/80496831356.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/fizabemenedezuputamas.pdfIn PDF document text
    • http://js-space.de/userfiles/file/dujutugezulub.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/divabivoborawub.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/82532416992.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/nedezukenofefivijunuse.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/48458773312.pdfIn PDF document text
    • http://ciskmv.com/css/file/45411219267.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/68822964758.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/26050298852.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/gapufezenexipepal.pdfIn PDF document text
    • http://blccy.com/userfiles/files/17966273537.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/74281184097.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132691bed144---xoroso.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/68639623676.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=when+will+season+5+of+mha+dub+come+outPDF 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_off0000db41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB41 11096 bytes
SHA-256: 3166f6ef10514bab319a19c627560dad45bc9b540f7887e779853bda049b8590
font_01_sfnt_off0000f508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF508 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1A 17072 bytes
SHA-256: 3cd0dd50726f82f6ce4142b0dea801114966e9bfbf6d558b564ad79e8c71a0f5