Malicious PDF — malware analysis report

Static analysis result for SHA-256 cef4662fae4c7873…

MALICIOUS

PDF

70.0 KB Created: 2021-09-29 04:42:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c04c5489883632635fe642ab552790be SHA-1: 409acaa27751fdd61e67a7bbca270a2a872bc726 SHA-256: cef4662fae4c78732150e8bf7d408cce137ea75b4ca3df6d8d60c990a2eb2d0d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://de-ko-gmbh.com/ckfinder/userfiles/files/forexexore.pdf In PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/totipetawise.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/76497075046.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/738188414.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/tibepeme.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/21750711589.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/wopewajisizomulaga.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/52338355274.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/61422719299.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/69496508563.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/piralixomakot.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/basumal.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56464202627.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/40227147242.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/nufaniw.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/neguxekivudijinoxalaboke.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/9d10d842b01500f4b9878b6899358bc8/30250259374.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/45842783010.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/14942471705.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/beniwazapu.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/gubevuluxoralupikojigetag.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/88736205039.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/newexoxerixupo.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f1bcaa43db---xadejovamesirexemakixuwiw.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/bovokidovovukawaloro.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210904083837416471.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=rich+dad+poor+dad+4+quadrants+pdfPDF 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_off0000b198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB198 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9AA 15704 bytes
SHA-256: 9989bbbd6282269eaf9e58529fa03be25dcf55cb2af1dde4f85418bfab7fe015
font_02_sfnt_off0000f138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF138 10908 bytes
SHA-256: 13ace2ecc0e02e7a32434f4f5159698716a7687bbe9068dc0fff3cdf5e1bf8c6