Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4e8b59107859f7e…

MALICIOUS

PDF

70.2 KB Created: 2021-09-27 21:18:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 82f00595fc816549f2dbfe6c4b52c280 SHA-1: 6e9c8e4ba3b45b712b2183bc60ed86b5476a5357 SHA-256: e4e8b59107859f7e5fe5490ffa25c70a9ab517e188e2e3597cc81806cd7da4e5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious websites. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://infrive.ru/uplcv?utm_term=shadow+fight+2+mod+for+pc PDF link annotation
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/vakiruva.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/4524906131.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/gisewelemu.pdfIn PDF document text
    • https://xulynuocphangiathinh.vn/images/pic/file/wipidurumoj.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/1851d17d057af5f5231d2281aec4bae3/24120883356.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/93630257932.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/25074640445.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/dasuboboxasumexas.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613574ac5c058---95914000562.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/badulenalu.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/99108923824.pdfIn PDF document text
    • https://breedlife.com/upload/files/35622566200.pdfIn PDF document text
    • https://sakesushimn.com/userfiles/files/ganopamo.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210913_C228EBE5C669180D.pdfIn PDF document text
    • https://lecachet.fr/docs/files/21444739716.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/192358653.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/60445459215.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/daxagem.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/tukol.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/27541233417.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/15841059416.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/79761838169.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_off0000b09d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB09D 10896 bytes
SHA-256: c5fed7e6af45788d005eb4600e63ef4ef260de69f739bc4384d4c72a530bbd69
font_01_sfnt_off0000c9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C2 16244 bytes
SHA-256: b0d96650eabd0581a62ea7af522d04d42cde60cd706ba41995893a51d1b4de36
font_02_sfnt_off0000f31f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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