Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb3ebbd6a10c7618…

MALICIOUS

PDF

80.3 KB Created: 2021-09-12 04:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fa17f3777647ec3c8500d13d142b7ca2 SHA-1: 3b136b561df6bc7432ae80cbdcfbee2125dd0a88 SHA-256: eb3ebbd6a10c7618e74848f64dcd6f8650bcf40643d904cce8db1307f16e4bcd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains, suggests a link farm designed to redirect users to potentially harmful sites. The `PDF_SEO_DISPOSABLE_LINK_FARM` heuristic specifically highlights this behavior, indicating a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://leprofit.ee/cmsfile/contentfiles/niraja.pdf In PDF document text
    • https://civilkontroll.hu/uploads/file/83206667217.pdfIn PDF document text
    • http://etyekilovarda.hu/userfiles/file/lezemomigorevoluwafukubud.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/57281844688.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/mujijagunakelifipeg.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/29822916544.pdfIn PDF document text
    • https://limsurempat.com/contents/files/tisifaxaxobepamoto.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/70312548687.pdfIn PDF document text
    • http://soupworld.de/upload/file/zafomedanilixono.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/kamajubapupa.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/85974160534.pdfIn PDF document text
    • http://esistore.be/userfiles/file/72423820070.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/jefazalodaberogelok.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/25900257492.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/8254651855d1e6132c24310a7664a4e4/89964536289.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161369ed00878e---zosepakepo.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/11686553213.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/bumudigoramixejixes.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/23130038495.pdfIn PDF document text
    • http://www.larucheapain.fr/ljk/file/roledikagozizopaxijagal.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/dovetevipobi.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/wivikedebuderaleri.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/24844882494.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/26696910220.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=free+top+up+apk+download+for+free+firePDF 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_off0000d7b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B6 10576 bytes
SHA-256: 4dbd7d631257a33a5c2f876d73200e771aea216f5e19fbf4264cc8e596c0d1fe
font_01_sfnt_off0000eff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10803 17212 bytes
SHA-256: 126b9fe1f09fd7edcc91280a3a5eb04b73f6898af7a46c6e9361b7754c2fac86

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