Malicious PDF — malware analysis report

Static analysis result for SHA-256 042fa6721a14d624…

MALICIOUS

PDF

76.2 KB Created: 2021-09-12 01:20:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 407ff7617fbaa551d0fd211768b0ef09 SHA-1: 7f689686ae68a6036da229759067ad970e110565 SHA-256: 042fa6721a14d6246179e7be1231655b3c82a5b41e43d73f4660d8b73d2c2cd5
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, with one specifically crafted to appear as a search result for an Android application download. The ML classifier strongly indicates malicious intent, and the presence of JavaScript suggests it may be used to facilitate the download or execution of a secondary payload. The document body is heavily obfuscated and unreadable, providing no further context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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://global-brand.net/userfiles/files/losirunarikopel.pdf In PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/64275384464.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/13284491998.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/28093169125.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/12477721434.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/78407863317.pdfIn PDF document text
    • http://cocoal.com/uploads/file/nuvijofoniv.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/fadakab.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/fitel.pdfIn PDF document text
    • http://showdoimovel.com/files/files/69019578446.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210908023704.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/lagamorigezogo.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/jolepamafavoz.pdfIn PDF document text
    • http://www.larucheapain.fr/ljk/file/2422938969.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/pinozurigamixovorajosas.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/wowivisamorelevalidub.pdfIn PDF document text
    • http://dentherapia.hu/files/file/xabozu.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/leroguv.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/95138492004.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/80184900221.pdfIn PDF document text
    • http://alacarte-husum.de/userfiles/file/40635964227.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/54993152175.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/sulawopasoroxug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=bus+simulator+ultimate+apk+download+for+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_off0000c018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC018 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82A 17944 bytes
SHA-256: b930a7dcd3fa76f3410160f3c84431ef530e427caffca1045598337edea3d1cd
font_02_sfnt_off000106fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FB 10988 bytes
SHA-256: 2265751dcf3a4b39283878672d63dda5a647ddb6c41f9e84679802a33f39c7a6

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