Malicious PDF — malware analysis report

Static analysis result for SHA-256 7885b2593bb0b72e…

MALICIOUS

PDF

67.1 KB Created: 2021-09-27 03:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: daf6f836d810cf980028956b6fed87ad SHA-1: 7724f67fa995d78eca4065f707aa12b9c58e5fb7 SHA-256: 7885b2593bb0b72e6cb455bc3f6757a02b47e8d5aef4dbecd8b7058b49ef2a5e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. This suggests the document's primary purpose is to redirect users to a network of sites, potentially for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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/76885423909.pdf In PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/kopafuzokusilenopenep.pdfIn PDF document text
    • http://orosweb.hu/userfiles/file/48197308381.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/33165661836.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/83603317935.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/fugobidademavutado.pdfIn PDF document text
    • https://isosklo.cz/uploads/34178431734.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/pibisaranez.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/gozodot.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/bimawuzeginivabikasepafar.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/23662001271.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/45516611041.pdfIn PDF document text
    • http://myhoteltrip.com/userfiles/file/71432790002.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/48085072357.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/xesibi.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/vusaremulevizugaro.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/80624726418.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614de62e53bab---dejukalopad.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/2741254097.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/nisogujumawapezek.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/67654846391.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/xutedolubetesofa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=excel+for+chromebook+freePDF 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_off0000ac14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC14 14376 bytes
SHA-256: b88a31ae6d7316589e7a845fd3065dec0f7d3141c70c01713ef53f49d717fdcd
font_01_sfnt_off0000cfe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE800 10296 bytes
SHA-256: b45f1d70a27dff1156b90665f9de875a082036c940bfac21e384dafb7e0fe320

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