Malicious PDF — malware analysis report

Static analysis result for SHA-256 66a2b24e933d8940…

MALICIOUS

PDF

80.8 KB Created: 2021-09-13 19:19:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 48eb6f10ea3addc3f3d6db157d5a9681 SHA-1: 92c5be7abe80374c6e23a65d3840d85a1ded4988 SHA-256: 66a2b24e933d89409557ed5bed8d80c28e9856cb91ac52e5c67b26d765a30b47
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the structure and embedded links point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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.
  • 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://thy-environment.com/userfiles/files/kejulofexanemoweb.pdf In PDF document text
    • https://kingcarmotorista.net/uploads/files/tinutofudopurogubi.pdfIn PDF document text
    • http://agro-partner.com/Image/files/71568266018.pdfIn PDF document text
    • https://hinaweb.com/upload/file/wefexowifik.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/b3fd12f0a890029c2ea7cd6fa89e7f1a/fedatipenumapebuporapoje.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/81917477439.pdfIn PDF document text
    • https://totounited.com/contents/files/jutalodarixowuxamur.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/78238340732.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/meleruwerorojoxipuxut.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/bedefivinokadefeko.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/78353048844.pdfIn PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/neperejop.pdfIn PDF document text
    • http://sinoorchids.com/image/file/tisubulotuxerinij.pdfIn PDF document text
    • http://asustainable.com/global/file/misoxeredurufabet.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b901d5f658---71740356948.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/1934980569.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/85864447398.pdfIn PDF document text
    • https://stancijanegrin.com/userfiles/file/tetefiw.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/jenadujomurotuboz.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/saletodoxigekuvera.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/zojobezusizip.pdfIn PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/77545264936.pdfIn PDF document text
    • http://ahchala.com/img/file/31897856369.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=young+radio+zango+apkPDF 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_off0000d109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD109 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE920 10360 bytes
SHA-256: 9a974515bb012334e2df6982de7394a7b54848d97dfad5646d8ebc649ee35875
font_02_sfnt_off00010064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10064 20160 bytes
SHA-256: 2888f30eec99de7b791218b2cd1c18786b277b928ad374461c8c19f6370954c0

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