Malicious PDF — malware analysis report

Static analysis result for SHA-256 45d92c238bb067ac…

MALICIOUS

PDF

93.4 KB Created: 2021-09-17 05:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 98823c7431525aade166d986600e468d SHA-1: cbf160b1177ecb5848a592cb8b83d602d37a1c8a SHA-256: 45d92c238bb067ac8ad2900e2cfc4f4f3b292ac8b25351e3136a23893cdd269c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. The primary purpose appears to be directing users to potentially malicious external 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 http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1a7b6a7ab---69714736535.pdf In PDF document text
    • http://thermogroup.ru/uploads/files/67499580899.pdfIn PDF document text
    • http://tuzoltosagmihald.hu/userfiles/file/97639431618.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/70803159240.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/tasulagotamowole.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/gulis.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/43909743455.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/fejonewegewepiruzamanux.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/254c24a4f565e8b5803d7f63b90056dc/69005706630.pdfIn PDF document text
    • http://petswithlove.com/cvsprojects/SSK/Source/2.0.0/images/files/49197997632.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/20929188856.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/9389188190.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/6894875923.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090719355068.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/xadavobuse.pdfIn PDF document text
    • http://intertravel.hu/_user/file/posugagedebidunimowowi.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/darabotupowux.pdfIn PDF document text
    • http://deauville.ru/files/file/11453961417.pdfIn PDF document text
    • http://ultrabeauty-ff.ru/userfiles/file/jelawugilore.pdfIn PDF document text
    • http://z500.si/files/lijidisesadulukiluk.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/89003021200.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/94136630439.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=rooter+game+streaming+daily+giveaways+%26+videos+mod+apkPDF 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_off000106b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B6 10904 bytes
SHA-256: 91da2feba196d0926c9ba49b9389057b58c53c4cf00966c8be471c114f6573d5
font_01_sfnt_off00011fcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCB 18216 bytes
SHA-256: b8458a450716440026bc9aa42c76ecc2785af0f1d57f2853a4f1b933dae73dfe
font_02_sfnt_off00014f6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1