Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7837d27c50ebf8b…

MALICIOUS

PDF

79.7 KB Created: 2021-09-10 17:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a8ab21c6ad906cda6b372a3e7c008fd8 SHA-1: 89831d42d805f589604b3f0ce54e96f6bcebe556 SHA-256: b7837d27c50ebf8b76e191268fca9b4faf9a5575db4749f628da969d5c46b222
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also hosts a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://rajaunited.com/contents/files/wunotizavuxofawoge.pdf In PDF document text
    • https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/92757943003.pdfIn PDF document text
    • http://allasclub.com/campannas/file/6202221816.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/44536353376.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/tixozimepanezobumug.pdfIn PDF document text
    • https://vespaclubcagliari.com/userfiles/file/48726118780.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/90151770487.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/75559898602.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/96322880165.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/39242791489.pdfIn PDF document text
    • https://red-adlay.com/upload/files/26547649720.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/tejepame.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210902_652F605FA0D196DA.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/setoseb.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/17462886460.pdfIn PDF document text
    • http://e-store-sys.com/userfiles/file/71830030507.pdfIn PDF document text
    • http://deltools.com/userfiles/file/xinud.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/7218374209.pdfIn PDF document text
    • https://eurotig.ro/file/99916545903.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/36417579805.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/manar.pdfIn PDF document text
    • http://hejia-ele.net/upload/batelut.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138332305688---sazuxuvasekupejadiru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=ebook+grammar+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_off0000d52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52A 17212 bytes
SHA-256: 3b805c0be5bd531d62fea0382a232e7b7aa3b2bae2c70881af36989a4ca7ac08
font_01_sfnt_off0001022d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022D 10416 bytes
SHA-256: 0d952d903d95a8dbaa19ce3e9b82b9c9845e8283866bb75c1ae12b8f81d9029e
font_02_sfnt_off00011957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11957 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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