Malicious PDF — malware analysis report

Static analysis result for SHA-256 d88e99b196011409…

MALICIOUS

PDF

81.5 KB Created: 2021-09-18 04:54:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ffefa86261fca6d1500ce20555966685 SHA-1: 8f9f6a27c6954f78125a1bd74254624c66e2bd8e SHA-256: d88e99b1960114095ad5d9ed15d9ad19584e7a5d1bf8e97e0987c957ba9ed65c
74 Risk Score

Malware Insights

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable hosting. The ML classifier strongly indicated maliciousness. The embedded JavaScript is likely used to facilitate redirection to these external sites, which are often used in phishing or malware distribution schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://robertfeinberglaw.com/images/edit_images/file/95078043816.pdf In PDF document text
    • https://kapokcmassage.com/uploads/files/202109080559041283.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210904172124.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/76756677392.pdfIn PDF document text
    • https://defi128.phpascal.com/userfiles/files/dadulusafake.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/91964184480.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/lomelakagewimoliguje.pdfIn PDF document text
    • https://oazapiekna.com/zdjecia/fck/file/bipemupe.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/2787699616.pdfIn PDF document text
    • http://protectakoteasia.com/ckfinder/userfiles/files/pekamit.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/gidukegamulijufegidop.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/55132662825.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/zuwawepuxefoluzamos.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/89995095861.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/baratawe.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/nemefinosileje.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335d7e8e7dc---42352819461.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/xugomojumawojeluzo.pdfIn PDF document text
    • http://merwepizza.com/upload/file/bijikanakuvelisuxiv.pdfIn PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/66497124184.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/sibarajevewoxamup.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/dalurivejibivasoniz.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/5613935317.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+change+my+gmail+address+on+my+android+phonePDF 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_off0000d8a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A6 17632 bytes
SHA-256: 1209e12232d77a5c4b8afb050b6ae775e3d07d3e83a958122a32e008d1c2326a
font_01_sfnt_off00010639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10639 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E50 11152 bytes
SHA-256: cfe3118fd4cf26d0095a2b602b51e8e681224acd22a125f6a587383499c7ce88