Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3e8bf6caeabb7d4…

MALICIOUS

PDF

72.3 KB Created: 2021-09-29 03:03:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c596084054e5bcaea398817a20605e74 SHA-1: b67389b800fbccabb2152f0102a6d74bf0169780 SHA-256: d3e8bf6caeabb7d4b156e6c18376920390cb9d026ac5269b6210a08db147f122
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects the user to one of the numerous external URLs, which are part of a link farm, suggesting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://donateagift.eu/userfiles/file/juwipefemabeg.pdf In PDF document text
    • http://lollanaclinic.com/image/upload/File/95649075424.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/60749653116.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/korimagobeliz.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/suwajutokavomimimojumupo.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/98300164824.pdfIn PDF document text
    • https://duel.pl/userfiles/file/waninojulilegimozedunoxa.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/8211838176.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/30532213829.pdfIn PDF document text
    • http://kbchina.de/upload/zobogotufelusapij.pdfIn PDF document text
    • http://lilipoupoli-drama.gr/lilipoupoli/js/ckfinder/userfiles/files/1495244903.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/xitozexolesa.pdfIn PDF document text
    • http://gzxmbx.com/uploadfile/file/2021092713570173499.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210924175625.pdfIn PDF document text
    • https://yantrasearch.com/ckfinder/userfiles/files/mepakusiwazajejir.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/19653859684.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/xekaxarite.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/nigekub.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/70885659229.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/fulevasivetonuwoxesube.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/161497fe5e9909---tekadagewaxivodekago.pdfIn PDF document text
    • https://pasarantogel2.com/contents/files/53354753419.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=what+is+g+sensor+calibration+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_off0000b28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB28E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000caa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA5 10780 bytes
SHA-256: d10cd05857b8689ab41388d3031b61f27588e9ecfee59e3269a3c9af439a8e26
font_02_sfnt_off0000e333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE333 18708 bytes
SHA-256: 30fa6f764ae6c110cbdc1617adc8a026cd3fd0af7b24a0dfa3c0c5eb7f063f6f

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