Malicious PDF — malware analysis report

Static analysis result for SHA-256 10b475ba8f8bdb9d…

MALICIOUS

PDF

71.3 KB Created: 2021-09-10 21:23:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 147304f4ffe49fea9ed0a0c9719efca8 SHA-1: d80c2316055fce9dfd8491c1357c81716167de27 SHA-256: 10b475ba8f8bdb9da827bc0161d12c4c52392da45a5fa1c19170e3272eb60958
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, acting as a link farm on disposable hosting, which is a common technique for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://oniceh.ru/uplcv?utm_term=best+sports+apk PDF link annotation
    • https://corianderedmonton.com/ckfinder/userfiles/files/13305486236.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341a97a0f85---77579671536.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7e2c524ea---viwigakideripukot.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/buxajoverilofutotolibaxin.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/duzedisetuzopizifaza.pdfIn PDF document text
    • https://angkagenap.com/contents/files/43629273237.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/kotofududekojinudizopizu.pdfIn PDF document text
    • http://inoxbienhoa.com/upload/files/20408755623.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/lowerifuzewifuk.pdfIn PDF document text
    • http://one9five.com/userfiles/files/42528886450.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/38009385927.pdfIn PDF document text
    • http://bojovesporty.cz/userfiles/file/tojakutuxakiderewasewotel.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/rofut.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/72680210084.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/23900587546.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109060024257561.pdfIn PDF document text
    • http://instalater-macecek.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/wiwegip.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/58067683630.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/66553730034.pdfIn PDF document text
    • http://sireny.net/share/files/nodamewegexubewemokufoke.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/vimosigun.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/tofebid.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/4889849767.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/muzalokuxibekurar.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/rrutjf9d84jos1rrrlfp5bg395/84637563484.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_off0000b821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB821 16016 bytes
SHA-256: 3db9c4eb338fd9a94847291f22f72cfeb1e4da4f64fe80771f66c036ac103e06
font_01_sfnt_off0000e0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EF 10148 bytes
SHA-256: 08276f13b0536872a4c0e904d2f68eddcce6640a4c95bba28aad279d96418c7a
font_02_sfnt_off0000f7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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