Malicious PDF — malware analysis report

Static analysis result for SHA-256 757dcafcaa0cdcd0…

MALICIOUS

PDF

69.7 KB Created: 2021-09-28 13:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 00d3d514819275c996e1203603336a5d SHA-1: 8b7af1fa2487fb14f23e1e08ddd747a52dde502f SHA-256: 757dcafcaa0cdcd0682b0985537a65b890ed67ab5771d328cf372cd34b9da359
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript points to its use in executing malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://sportingfoundation.com/uploads/file/62552618846.pdf In PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146b96aa64f9---xelirideb.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/zifepelafesuzaw.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/wujumer.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/92892589057.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/15441880774.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/wibudatozum.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/wujoxuwewunigemunij.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/1335830423.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/wekojajomix.pdfIn PDF document text
    • http://zatacorp.com/upload/files/5490513683.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614dde99ad344---31016421693.pdfIn PDF document text
    • http://hijoin.hu/editor_up/mujixolugo.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/22336616684.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/18537558512.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/81841831122.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/xurakidubebitijopiwunugot.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/87932644856.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/xanoridagebixone.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/riruwojuboxegawijada.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/31336297207.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/9848342958.pdfIn PDF document text
    • http://soupworld.de/upload/file/mofavoku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=the+anarchist+cookbook+pdf+downloadPDF 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_off0000b034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB034 15104 bytes
SHA-256: 953258be2c230c0dc06d74fd722c32dde828c8b74437ae245c32f5a4da549e86
font_01_sfnt_off0000d5e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF7 11000 bytes
SHA-256: 10a197bbb1b05b1a383a65171f207b0fa9b4f4e1fb5e7bf7c43b4451aaee5a8d