Malicious PDF — malware analysis report

Static analysis result for SHA-256 40fdc6b8034322df…

MALICIOUS

PDF

83.4 KB Created: 2021-09-18 06:53:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6df506ec47b8d56fc5446a701493d7b0 SHA-1: 49f797f9baa4170875107a1a8bb1a01dfc6d1c05 SHA-256: 40fdc6b8034322df719eee5d23579292cb05eeefabee8496d6621ccb82d35209
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, indicating a phishing or malware distribution scheme. ClamAV and ML classifiers strongly indicate maliciousness. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the malicious intent by identifying the PDF as a link farm on disposable hosting, likely to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://archism.ru/uplcv?utm_term=fantasy+card+games+for+android PDF link annotation
    • http://cuoredicane.it/userfiles/files/54361220168.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210913095055.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/sadosim.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/35706345447.pdfIn PDF document text
    • http://www.hkimm.hk/_bin/ckfinder/userfiles/files/xexujovanubesurevupu.pdfIn PDF document text
    • http://ewtch.com/upload/files/pebemugerofuda.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/77394705345.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc17f264d7---76776845786.pdfIn PDF document text
    • http://ridendo.cz/files/file/kitumoxobojuzeb.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/40354236249.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vimovelatavalitide.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/89770392144.pdfIn PDF document text
    • https://ekransamara.ru/files/muxukepoje.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/vusanok.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/88520184805.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/raxipitulibivolu.pdfIn PDF document text
    • http://bilateralmatters.org/userfiles/file/nuduvekej.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/12282281951.pdfIn PDF document text
    • https://akvanova.ru/sites/default/files/68899931305.pdfIn PDF document text
    • https://ottopianos.nl/files/tojevovivid.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/80127022274.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8f3b153dc---59245633534.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_off0000e2c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD5 17320 bytes
SHA-256: d1e01ac4927d8cb3b896a0f1484eeda0a5262b13b7fb2fbeb4cc78b9b9208094
font_02_sfnt_off00012716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12716 10864 bytes
SHA-256: 7ef0d24eeb8ec1b5b18b4dc84daac95481152fbcda144ca85e6570e7e328734a

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