Malicious PDF — malware analysis report

Static analysis result for SHA-256 bed39989a7ea21bb…

MALICIOUS

PDF

82.4 KB Created: 2021-09-24 02:08:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1b56afd6f4e87f4ebe50e45e6f21bdf9 SHA-1: 3fc36f3b8fcee176880398469120460c9c35aa19 SHA-256: bed39989a7ea21bbda94b35be3c62befd498f75d068d557bf375aa211cfe8b18
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to other PDF files hosted on various domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates that the PDF acts as a link farm, likely to drive traffic or downloads for potentially unwanted software, as suggested by the 'utm_term=download' parameter in one of the URLs. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://rdsdealers.com/ckfinder/userfiles/files/lubawe.pdf In PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f3e0cdd00---lojaz.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/zegabivuretagamuxafimas.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/nimejomigutosuxugakela.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/xikabu.pdfIn PDF document text
    • https://granitnet.hu/editor_up/51742017812.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/fenedanad.pdfIn PDF document text
    • http://majedalkarkhi.com/pics/file/jurirojuxa.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/16701202228.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-23/20210923071103159397.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/4113962605.pdfIn PDF document text
    • http://araulmor.tel-cor.com/images/library/file/54320161891.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/799335200.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/45623100633.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/2109031256228237478pejkg.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/mozutuwatafolenujerekajif.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/lutigagasutago.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/57762560572.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/54088894771.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16149ca498da86---dozumuwewifupawepuj.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/zezedimomonokitugas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=download+alien+creeps+td+mod+apkPDF link annotation
    • https://www.thc.gda.pl/ckfinder/userfiles/files/wasuveme.pdfIn PDF document text
    • 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_off0000dd54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD54 17628 bytes
SHA-256: ec3911926c47fb01dac4cfab6ab83c6c9bd73f2b542e7e75e1c4a174c60af631
font_01_sfnt_off00010b02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12319 10856 bytes
SHA-256: 701179c5aecc304e1ad6e0b11e1d3c19e696ed728e465a56fe5318c0227cb0ad

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