Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3914ce8961d7120…

MALICIOUS

PDF

79.3 KB Created: 2021-09-17 07:36:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 870bbad742c0a4f6e6da83530b765025 SHA-1: e409f8c56a14468c9ef50eae14ac2cb67e88fd04 SHA-256: c3914ce8961d71208b97aa27d101bcf6886d0cbd15901e494184d03e1b048fba
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links that point to a variety of domains, many of which are structured to appear as file downloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates that the PDF is part of a link farm on disposable hosting, suggesting a malicious intent to manipulate search engine results or distribute further payloads. While no scripts were directly extracted, the ML classifier and ClamAV detection strongly indicate malicious behavior, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://maciejabramowicz.pl/upload/files/file/konujesavilowawosanazuzul.pdf In PDF document text
    • http://librojuridico.com/aym_images/files/90427958946.pdfIn PDF document text
    • https://airxps.com/userfiles/files/xuripubid.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/sokanilorevigusimag.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/pexifabuzogufe.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/73389891552.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/pabifokar.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/81997651600.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/39136204981.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/306b7111e2675c5e5caf62ff2e103cf3/sogovososori.pdfIn PDF document text
    • https://losaltos.com/wysiwygfiles/file/70137836595.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/dubinosaxege.pdfIn PDF document text
    • https://nepalonlineexam.tisaracademy.com/userfiles/files/99911273964.pdfIn PDF document text
    • https://birotex.rs/images/files/32921455500.pdfIn PDF document text
    • http://kietminhrivet.com/upload/files/32251157937.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/67832731365.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/f88e4114524af48903aa449641879bff.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/35808579334.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-14/images/files/35712991359.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/nepozikezo.pdfIn PDF document text
    • http://huabulaw.com/uploadpic/2021-9/file/2021090907275573499.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/lefiwolinuvi.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210910185932.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/diwedutonujumeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=vlc+apk+tvPDF 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_off0000d25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25B 9780 bytes
SHA-256: 23c131ad318e89e23a5c97fa4e7d2e7d64b779a15b7cc4c7061397928dd4f026
font_01_sfnt_off0000e7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001000d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000D 18376 bytes
SHA-256: 5338a9d72638b0644962c9341155aab7dc1570ce39b80f2a47470797d05bc732