Malicious PDF — malware analysis report

Static analysis result for SHA-256 de8dd6ea6334804c…

MALICIOUS

PDF

81.3 KB Created: 2021-09-23 05:26:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 927d804893f0749f8d9b761d699d4c20 SHA-1: 24ebb7e8334d481b65d1a7ae8f6c35d3a8d0257b SHA-256: de8dd6ea6334804c6a8f951c354d3e595f7dbe2b1b27a0aff715eb7f8aa9d0d0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to unknown or potentially malicious domains, suggesting a link farm or redirection mechanism. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to exploit vulnerabilities or trick users into visiting these external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cwpni.com/userData/ebizro_board/file/25694171554.pdf In PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/nubomeluguvagufibaxod.pdfIn PDF document text
    • https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/birowutut.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210906083054.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/26092289500.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/24200850876.pdfIn PDF document text
    • http://elitk.ru/_files/wuxogeluzajojokoterowek.pdfIn PDF document text
    • https://farsiherbal.com/cache/fck_files/file/20222402048.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/regedoxulotudutofevij.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/9g3cv9m4lfp37uludchmr952q0/42548829116.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/levidamadesiboluvawofo.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/83182437415.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/38b19836f6c35d211b08ae21cc9d4f83/pakenanulegelobo.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/zoxenaxevezewupeve.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/35347290996.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/lexifizujupi.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109131234261911.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/xezadezevozuditufelotamo.pdfIn PDF document text
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/61694449682.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/63909826871.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/33404132461.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/65376926797.pdfIn PDF document text
    • http://mamitobe.ru/files/file/29134791766.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=bleach+3d+mobile+modPDF 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_off0000d0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E3 20696 bytes
SHA-256: 65b4505c87e05f2a699a9ef3768ab9efcf629f84d4ef7791f80feb655c3996a2
font_02_sfnt_off00011fb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB8 10532 bytes
SHA-256: 6b056cd0530cc443432f008c9470982f95b7dc0e427703678f1421c5bd18f7fb