Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3976b5ccd47db9a…

MALICIOUS

PDF

78.4 KB Created: 2021-09-17 08:10:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: dea9115ef6b85dadc70a46a7dd3b5fd7 SHA-1: bacb1cb7b0ebaef43c1febf4387175c564f87d40 SHA-256: b3976b5ccd47db9a1f239bf7b8db8214881e6399d4fc2b4bbdaca1dfb7d33b70
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 PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to numerous potentially malicious or phishing sites. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://jungleflightchiangmai.jungle-flight.com/Uploads/files/nopowa.pdf In PDF document text
    • http://thingsantiquesla.com/userfiles/files/18959148645.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/xunaragapuzus.pdfIn PDF document text
    • http://salt17.com/userfiles/files/32652479390.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///46705106410.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/79866246830.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1613e22703aa4b---26102786952.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/95727231284.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/rufabapenokibo.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613dee14638d1---99336453782.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/beroguvoditufubun.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/71356908523.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/85230503127.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/mofuladuwugometaxe.pdfIn PDF document text
    • http://frickcontrols.com/uploads/files/72759085184.pdfIn PDF document text
    • http://skinct.com/upload_file/file/Fl202109100944162477.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/lotabapukizebapete.pdfIn PDF document text
    • https://ratosatu.com/contents/files/zuximoxefuf.pdfIn PDF document text
    • https://radio-clipa.ro/userfiles/file/744057375.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/zolusuzaxedatex.pdfIn PDF document text
    • https://chv.vn/userfiles/file/dilulidanejemifozive.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/fawuneru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+change+telegram+app+icon+androidPDF 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_off0000cf89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF89 10872 bytes
SHA-256: 0c34e04c3d322276accef13a09928e0671978ab9407fe08cd8cd1f4ea2c8da78
font_01_sfnt_off0000e838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE838 17480 bytes
SHA-256: aa663151464030f39b3e4e1a886d6d18896482f6fd5ee463c70b1183bb8144da
font_02_sfnt_off00011423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11423 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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