Malicious PDF — malware analysis report

Static analysis result for SHA-256 664bcf1b77271c24…

MALICIOUS

PDF

71.1 KB Created: 2021-09-26 03:49:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3472174c4dfe2577726c1e51ab3fb136 SHA-1: a2ee692e2c39147c01d4dc8a490e0870afc1fbba SHA-256: 664bcf1b77271c245bc3eacb3d41514d7fd876deb6044b45aa759dd153943a7e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to download further payloads or redirect the user to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pixomot.ru/uplcv?utm_term=walking+dead+2+mod+apk PDF link annotation
    • http://dtyxbpzx.com/filespath/files/20210903052513.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/84438397892.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/jotitazoxexananin.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/30774295424.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/ravelafikumasalidusuk.pdfIn PDF document text
    • https://loppisidjupdalen.se/images/uploaded/file/pamixoderomivuvazekogu.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e41f431162---kofudikopobos.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/12980132159.pdfIn PDF document text
    • https://www.informacion-indoorclub.com/boletines/img/file/vugudavikelimu.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/jalenepadijemoli.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/04264e96b2733d79618edc5aba6737f5/lasopasi.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/zupalovapuj.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/lexubigaxomirifi.pdfIn PDF document text
    • https://reniuved.it/file/xelatutizamo.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/lixose.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/tiwimemirupeduwoxotew.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/dawasaxomojexite.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/fetebigezolile.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/fobozuxirofodulepimup.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/48158276182.pdfIn PDF document text
    • https://performanshost.com/calisma2/files/uploads/8398868467.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/67712295837.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/63451276581.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/4046015108.pdfIn PDF document text
    • 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_off0000b37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB37D 16812 bytes
SHA-256: 16be44d5417e0adb580e7e55021ac9dab977afcba7a26ce4c7799e8c204d1f85
font_01_sfnt_off0000deca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E1 10572 bytes
SHA-256: 559703201ff727f498436a2034076f8e5750f92f972304f59d935e721ae4de9d