Malicious PDF — malware analysis report

Static analysis result for SHA-256 89b05b324354d707…

MALICIOUS

PDF

75.8 KB Created: 2021-09-10 20:09:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 230f34cecbebfcc6c3bec06ccf6b7b84 SHA-1: 922f8761bbafb7b9adb42df5d4e17c42374f69ff SHA-256: 89b05b324354d7079c3e9397a8d89a3b01f5c6360d59e321880c01eb27448fdf
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier strongly indicated maliciousness, and the PDF contains numerous embedded URLs pointing to potentially malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a deliberate attempt to obscure the true destination by using a large number of distinct, potentially disposable domains. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • 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 http://alotercuman.com/ckfinder/userfiles/files/60193421746.pdf
    • https://braintreeclinics.com/app/webroot/img/files/39974496256.pdf
    • https://honghow.com/ckfinder/userfiles/files/dafovebiwimodadekudizu.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16136162103f54---pumunugukomuwujaxiselapa.pdf
    • https://lentes123.com/aym_image/files/10327368931.pdf
    • http://hanhthien.net/uploads/file/70125471820.pdf
    • http://abogarestudio.com/userfiles/file/rawilabenoverisodipapul.pdf
    • http://kunmobile.vn/files/uploaded/20210907/file/12264859424.pdf
    • http://brandorbit.in/userfiles/file/54294390829.pdf
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/tidumufitewoxigila.pdf
    • http://dezmaster.com/userfiles/file/11431025112.pdf
    • http://aodaiminhhanh.com/app/webroot/uploads/files/74342894091.pdf
    • http://bright-inter.com/file_media/file_image/file/7115802636.pdf
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210901082530.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361ddc50138---vesuzun.pdf
    • https://morabia.fi/images/file/58206009841.pdf
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/56764998498.pdf
    • http://maekuangudomthara.com/ckfinder/userfiles/files/ruxigulobufujab.pdf
    • https://coherence.cz/userfiles/file/doxigebejikomizej.pdf
    • http://hyundai-baoloc.com/luutru/files/54023947318.pdf
    • http://kbchina.de/upload/tofujidojujes.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=list+of+irregular+adjectives+comparative+and+superlative+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000beca.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBECA 16792 bytes
font_01_sfnt_off0000d6e1.bin
d93282cbaa304ab860171d7ec6dd36363224952401929a951cd23cace827ada9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E1 11216 bytes
font_02_sfnt_off0000f0ef.bin
46a16706b68cb9c129361992bfa33bac254a9a6ee078927d062d5b1eb584e88e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EF 18560 bytes

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