Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b137c3ff8d95df8…

MALICIOUS

PDF

81.2 KB Created: 2021-09-21 23:46:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 81775ebf56f2e4e2839eed3d3819615f SHA-1: 401e25b1a6bb99cf28664eecc955f5def7f608c6 SHA-256: 8b137c3ff8d95df82ea6f0f6ea2612e6c10f39991edc793e7cb58cec50de3bf5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, indicating an attempt to execute malicious code. It also features numerous external URIs, many of which are hosted on disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://turdv.ru/SITE/files/editor/file/7731192166.pdf In PDF document text
    • http://muszempilla.com/files/file/xasopifodivol.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/0b0066ca66e6af52842c9cee2d758765/14260594148.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/32396457585.pdfIn PDF document text
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/gevuwe.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/tokadusemolekeg.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/13321408531.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/zajuf.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/zejozefitowororo.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/33625968690.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/47656684064.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/lojakafaw.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/sizisepenewewarivuvixu.pdfIn PDF document text
    • http://nemochem.cn/upload/files/faxusiwidoxukikum.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/95547221849.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/45162084639.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/87727586404.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/47200416218.pdfIn PDF document text
    • http://sushi-belovo.ru/files/30743290077.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202109090110163137.pdfIn PDF document text
    • http://vicc.huh.hu/UserFiles/File/xigodal.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/17523212534.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/vojawujagox.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/mesaxomepurudenogek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=piano+magic+tiles+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_off0000d71b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71B 18204 bytes
SHA-256: 44cdd374aaa614ce3704c7f835f8e91e7470d53e931fa9d4afb35c57293d243e
font_01_sfnt_off00010671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10671 10848 bytes
SHA-256: c1dfcd71508aa14c39759b10b9fefec4504e89daf9c9aa65f89f41f649cd663a
font_02_sfnt_off00011f4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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