Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceb1d2e09e4af0db…

MALICIOUS

PDF

72.7 KB Created: 2021-10-03 00:12:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fead8341e58a26324b2763f9cb796f1d SHA-1: 70b0c9f1d2ce922fffd0eec5a7eb95a35e417455 SHA-256: ceb1d2e09e4af0db2739b400176e1714fa7ed982cf96337a85db00e10fe2a04e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and the presence of many external links suggest it is intended to redirect users to malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://clinicaveterinariagoitese.it/userfiles/files/12021888583.pdf In PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/gojerogawajuwa.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/repawagutu.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/80406471682.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/89360692545.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/wixuluvelovonamiligote.pdfIn PDF document text
    • http://elementyzlaczne.pl/media/file/kivesuxezepebimixikogiz.pdfIn PDF document text
    • http://taxfreepoint.com/file/gikupe.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/92395775570.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109030033584103.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/b1586b9eb33228f61e11b0329cfe3142/34836197179.pdfIn PDF document text
    • http://michellenevinracing.com/FCKeditor/file/kuxewozogog.pdfIn PDF document text
    • https://pokereshop.cz/data/file/28219479901.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/ferokuw.pdfIn PDF document text
    • http://fitviewer.com/files/file/44224572573.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/darivizazojopujep.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/38540058323.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ae4988169---7020087647.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/26092140256.pdfIn PDF document text
    • http://888chji.com/userfiles/files/72994748717.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/pobeluwupeno.pdfIn PDF document text
    • http://gsnursing.in/ckeditor/ckfinder/userfiles/files/94041297934.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/37144079499.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/mefaba.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/37475282049.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=boundary+fill+algorithm+in+c+with+outputPDF 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_off0000b551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB551 11120 bytes
SHA-256: f71cf6494349fb28d6b6be1ee904820331bdbec1c95f5ae0f67dcf1d5eb025df
font_01_sfnt_off0000cefa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e70c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70C 17204 bytes
SHA-256: e7e8e3f5fa5f97577b330bdd4220b466f936ad70fd4b3f3d0ce18cdf38b462a1

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