Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aa094ca54c3c6bb…

MALICIOUS

PDF

82.6 KB Created: 2021-09-20 09:21:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8c5b62ae46da05e2a3e3441ec4f5c532 SHA-1: 72e9d81ff956b3b4ba54395863490012c85720e5 SHA-256: 9aa094ca54c3c6bbd21d31c343350dd43cea28718c95401d01b4f616c2f6ef85
166 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating a social engineering lure to install browser extensions or updates. While no scripts were directly extracted, the PDF structure and numerous embedded URLs suggest an attempt to redirect the user to malicious sites for further exploitation. The presence of many disposable links and a link farm further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://newtarrytowndeli.com/uploads/files/32999900079.pdf In PDF document text
    • http://chipgene.com/image/files/20210908_211555.pdfIn PDF document text
    • https://europartner2.pl/uploads/zigetuwixitilosuzidanakok.pdfIn PDF document text
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/diroxexug.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/15366272441.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/16907534387.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/diloxenino.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/wexapavo.pdfIn PDF document text
    • https://stotex.rs/files/81327157234.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/vifasesu.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021090413212781.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/13834796604.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/maxidapumejidozo.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/pumumegafojap.pdfIn PDF document text
    • http://furniture83.com/upload/files/53273983071.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/44969481961.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/ruwef.pdfIn PDF document text
    • https://kompaspt1.com/contents/files/basakenopemoputixuravodu.pdfIn PDF document text
    • http://benrassam.com/uploads/files/80738540409.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/jatalowobuririw.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/34651322468.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/84252294025.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/40919291590.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+turn+on+text+message+sound+on+androidPDF 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_off0000de3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3C 10824 bytes
SHA-256: 9dabb141a7b77f974a7e4aac0ffd95fdc983655e413e18943fe15273a009965a
font_01_sfnt_off0000f707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF707 17588 bytes
SHA-256: b9c36eaff34fbc46dd7c94c1a7cf28ab98b6cadba67d7117a6db42b08330c2db
font_02_sfnt_off000124b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.