Malicious PDF — malware analysis report

Static analysis result for SHA-256 b376ee8f477927fd…

MALICIOUS

PDF

92.4 KB Created: 2021-09-17 20:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a9b4dc92d0954db33ade004ee0a7c208 SHA-1: e6214f478c1a4209ca9d4a9521dfc2c847085b39 SHA-256: b376ee8f477927fd764bb9e4d85a8f55fa96b166c736403b2f38eaac8be16820
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 that point to disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The presence of these URLs and the heuristic firing for PDF_SEO_DISPOSABLE_LINK_FARM strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://krisoc.ru/uplcv?utm_term=hbo+max+unlocked+apk PDF link annotation
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/21196247587.pdfIn PDF document text
    • http://3q1p.com/upload/file/210909171357408896spilmp13whvl.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/61008093359.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zukapiwonikopajozimova.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/wofuvawefajifabavutogeba.pdfIn PDF document text
    • https://tefen67.com/userfiles/files/makesiniz.pdfIn PDF document text
    • http://reopen911.info/media/file/1290591726.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/luzosedin.pdfIn PDF document text
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/40087900931.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/gotaporarakimizobinajefo.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/65499056630.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/95759280720.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/bufenizawega.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/xigulagutixutotorefowak.pdfIn PDF document text
    • http://melabo.com/upload/files/72330278498.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-12/20210912015345146997.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37741792079.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/61219788332.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613e55c7d3ff5---negevorivarubiwumamilapo.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/62228673329.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613595c74d9a1---tiwig.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_off00010199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10199 19344 bytes
SHA-256: 36021f0020faf7b51f413a057582028dd6db79485aa1ee53352c6618382bf17e
font_01_sfnt_off0001341e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1341E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014c35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C35 10644 bytes
SHA-256: 824f334bd3c9ec1fa1d1656980216398f7cfb9759c44038002f384f1ac1b0f4f

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