Malicious PDF — malware analysis report

Static analysis result for SHA-256 d28be4b0c2c4578c…

MALICIOUS

PDF

74.6 KB Created: 2021-09-17 20:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: af028c2db43537dfb84a82c3ef314b84 SHA-1: 55bdf32918b092211214c4533fe9bfd800e8f176 SHA-256: d28be4b0c2c4578c7ae5dff34c2fd1ddc6242939cc48f2c991ea916c93f436af
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host numerous links to external sites, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gaziogluenerji.com/images_upload/files/bunozutojoxizunakete.pdf In PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/nexod.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/kaxenaduget.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/buzeladedigifowelez.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/sigad.pdfIn PDF document text
    • http://flomojapan.com/upload/files/83685540807.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/47246835040.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/87059354525.pdfIn PDF document text
    • https://umartravel.com/files/74458874200.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/18737920555.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/58859917535.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366dd3bc752---45673000674.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/tupot.pdfIn PDF document text
    • http://fgosvo.ru/files/files/29050021077.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/99786497281.pdfIn PDF document text
    • http://skupka23.ru/upload/m/wapadelamunamifitinem.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/merepawavupaxitid.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/23099316327.pdfIn PDF document text
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/95101185618.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/65651810986.pdfIn PDF document text
    • http://methese.com/upload/files/94891229486.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/gukudejufezal.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/fakelilavuz.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/nepemifebu.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/87947738173.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=myradar+weather+radar+apkPDF 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_off0000c3da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF1 10244 bytes
SHA-256: 33441ba6894cde6eba84c3b133ba3c8dba4266d434c6b7ce45582b69432ebce6
font_02_sfnt_off0000f321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF321 16068 bytes
SHA-256: 78cf1c759f3350e0b7f22e2b5a606aad2d29b9ac2485844417d9d6cc2b4922ed