Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8e598cd0bfa185d…

MALICIOUS

PDF

78.5 KB Created: 2021-09-17 21:11:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b7edb3407afb0a3fb9e9d717e78cc9e6 SHA-1: 136eead046e49b20a555f3dabf9ce68bb565fe06 SHA-256: d8e598cd0bfa185d78ef80a1538fe27223050db623f9f86c19fb84cd3f36c103
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external PDF files hosted on a variety of domains, many of which appear to be disposable or low-reputation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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.
  • 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://tingchucontrol.com/Uploadfiles/files/ziparijedodoxode.pdf In PDF document text
    • http://rc-modeller.se/images/file///13560804437.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/25117829008.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202109041310040095.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/41668408206.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/41435326235.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/43720958243.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210907034619.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/26347229149.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c265e5c9a---57399358086.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/48304375432.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67725148700.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144824344b06---34063668874.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/47017256132.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/65410886133.pdfIn PDF document text
    • https://wmu24.ru/media/file/xojukimafuxunel.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/mixig.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/rumaguzurebuzapimivu.pdfIn PDF document text
    • http://lpxs168.com/filespath/files/20210906135850.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/64436615561.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/wikefavuxewozofipisowexid.pdfIn PDF document text
    • https://ginecologmuresan.ro/ckfinder/userfiles/files/30871194428.pdfIn PDF document text
    • http://kotolantopeni.cz/file/zagesunimedudukolejipisof.pdfIn PDF document text
    • https://jotelek.hu/files/file/23514793078.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+use+pc+keyboard+on+android+phonePDF 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_off0000cd60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD60 17336 bytes
SHA-256: a89ef8c8a2bc5c1f300545bbd0c845eb76b908c5d7ff859d27020cb57b890945
font_01_sfnt_off0000fa79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA79 11088 bytes
SHA-256: ae49bc72e95228024420332d71fb71871e3ede884f3a4b511158181b94d2c5d7
font_02_sfnt_off00011420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11420 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1