Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcf42b067de171d4…

MALICIOUS

PDF

97.5 KB Created: 2021-09-18 00:04:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 118402a89153b7bf85d02f80f775b12a SHA-1: f527383d312c5a8eed3929a96531bedfec4a5be9 SHA-256: bcf42b067de171d4436b95a28e0970991b73b4aea58c70be85d99631c6e60729
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for malicious PDFs to execute code. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and the numerous unknown URLs suggest a phishing or scam attempt, likely aiming to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://qataminational.com/uploaded_files/userfiles/files/gagozuto.pdf In PDF document text
    • http://togclick.com/media/userFckfiles/file/jenojadavapomavulusumitup.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/ridabodikefimafovipeb.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/21668793843.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/69667822086.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/58542800067.pdfIn PDF document text
    • https://tsegypt.com/file/8321787177.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/31879502479.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16135e526c3e84---40012932899.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/96482349624.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/96307590637.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/kujekosezadiris.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/nutisegemuwuxutosoboko.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/6203732418.pdfIn PDF document text
    • https://homecareangels.ca/files/files/files/sulefok.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/78200112640.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/26467014188.pdfIn PDF document text
    • http://celesteandtorsten.wedding/images/file/vejuxobuwediwiwirawu.pdfIn PDF document text
    • http://proart.by/media/file/welet.pdfIn PDF document text
    • http://33podarka.ru/pictures/files/29802761622.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/18314771316.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/71475006455.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/54714569898.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/tufitusumofogagogubulu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=sistema+push+y+pull+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_off00011535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11535 19492 bytes
SHA-256: 4b66474dfe55a97f09cfda5e2475fdc858de394381f5de597fb382ef17110f39
font_01_sfnt_off0001474a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1474A 10728 bytes
SHA-256: 380efa50dce0ef973f9ee7627010b7286eceaf906f2d5b2799aea56dc4e56389
font_02_sfnt_off00015ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1