Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e666425c28ceb0f…

MALICIOUS

PDF

69.2 KB Created: 2021-09-26 01:15:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b665a9b9935fa98a39005b898edcdb85 SHA-1: cfe2d87e0bef9426fea7bc199f027d757859bee4 SHA-256: 9e666425c28ceb0f9567df8489e74862299457ee25d4297f7c1d5922a4c40f88
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to unknown PDF files on suspicious domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a high number of distinct hosts and links, suggesting an attempt to distribute malicious content or phish for information. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

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://negaratoto.com/contents/files/pixerawanege.pdf In PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/1sg6q4dgjgkte7l95b71s0ok53/sefuvedijijawikiganof.pdfIn PDF document text
    • http://recviem.ru/img/upload/25646418696.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/dadunupikubi.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/9591783837.pdfIn PDF document text
    • http://medrea.ru/upload/files/12675582372.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/32511645347.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/61484287180.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/36745555601.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/92516412920.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/biwukatuvawesu.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/6062988043.pdfIn PDF document text
    • https://aedwea.com/upload/foto/vawosimu.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/69455156672.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/10722142734.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/2616255476.pdfIn PDF document text
    • http://rebeccaosborne.com/uploads/xikowixajesejuwir.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/61084730441.pdfIn PDF document text
    • http://hopkim.vn/upload/files/68146063886.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380e50e8cc8---pijoxusipapomo.pdfIn PDF document text
    • http://metapolar.hu/tmp/75033123513.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/wivuteda.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/33074601755.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/jelesesesibizawobu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=zedge+for+android+appPDF 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_off0000b265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB265 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA77 15268 bytes
SHA-256: 38fb4e2f216491cb1a58700f8d29aadb95f0592bbc3505cce7a5fb67d4fd4d04
font_02_sfnt_off0000f04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04E 10324 bytes
SHA-256: bb52f2b0f9ae5241cc2bfd19ab65d9abacbf710d75c7726e66e19bff1a5b29e4