Malicious PDF — malware analysis report

Static analysis result for SHA-256 1afdd300b25a34db…

MALICIOUS

PDF

81.5 KB Created: 2021-09-23 21:17:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b56f74dc707a777a40c448ddabba1d22 SHA-1: a5f419fc9952c4621a9143828315eada7436ebd0 SHA-256: 1afdd300b25a34dbf3be18cda76bbdc36714d371e6755794a124b20c0ceaffd4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to potentially malicious or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or download of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://www.hz-kontejnery.cz/ckfinder/userfiles/files/foxoxuxugedawolimexukax.pdf In PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/nanujagekaloragodepujo.pdfIn PDF document text
    • http://thayloilocnuoctaihanoi.net/upload/files/kogivovejus.pdfIn PDF document text
    • http://glassick.com/userfiles/file/gubabete.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/43077082410.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/nadenovurojeviguloxeribu.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/jerinali.pdfIn PDF document text
    • https://ksboutlet.com/file/files/mipegimaremaxerexuwewuwa.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/japazijukajedogukejavukew.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/6313462347.pdfIn PDF document text
    • https://ubranni.com/uploader/files/kedijit.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/b9a6b5228cdd144eb6ed12f976d30abc/60500406363.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614456881434d---9134857930.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/67860008752.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/72725511772.pdfIn PDF document text
    • http://sxnqx.org/upload/file/Fl202109021055062227.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/24705910645.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/zufezogakosazofu.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/jilenaxin.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/tavomasazigizamotewaxu.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/jitaworutopeverupel.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/dovagutuguz.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/54333358585.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=t%C3%A9l%C3%A9charger+application+play+store+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_off0000d7a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A9 17636 bytes
SHA-256: 10932e8221216ec0d4e3e5d49c3e2c3200a8616aba81b2eda961dbbe4dac35be
font_01_sfnt_off000104bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BC 11024 bytes
SHA-256: a6c13bcf2fcd1d3aa300f0d2c9ffb7d2441e47381dda95425de4f19e4f366772
font_02_sfnt_off00011ddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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