Malicious PDF — malware analysis report

Static analysis result for SHA-256 4390ca5b830ee15f…

MALICIOUS

PDF

84.2 KB Created: 2021-09-19 04:33:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8b83697f4669e951d9ae6371f63f885d SHA-1: 4ebd0b5eb65df0835a7cf7c2a048128e8e97ab83 SHA-256: 4390ca5b830ee15ff41c23e10ba4fd87136ddb4035043d66d250a701d51ee642
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://catamma.ru/uplcv?utm_term=free+movie+streaming+app+for+android PDF link annotation
    • http://feldbach-tourismus.at/files/41793633840.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/rekabefufuwedezu.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/tadije.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/mekomegojugetizomixovez.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/nojune.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/risejuvukedigew.pdfIn PDF document text
    • http://newworldss.com/uploads/file/kalewep.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/67941694230.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/pewexedufowazi.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/nisuvilebokopabepatutif.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614476889f8ae---25920392419.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/wowowinifinadu.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/210910023711863965pgix0.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/gijatuxuxukemubes.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/19012529371.pdfIn PDF document text
    • https://jackinthegym.com/uploads/files/202109132350049541.pdfIn PDF document text
    • http://naviway.su/upload/files/kazutejok.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/fugeleguzur.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/94724605060.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/99604702746.pdfIn PDF document text
    • http://jca-t.com/fck_image/file/2514614207.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_off0000e470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE470 17980 bytes
SHA-256: 571a15a76d5b0dd8b18ac3b6e577a22b92b444088f8f49922f4707bc59248c9c
font_01_sfnt_off00011292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11292 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012aa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA9 10836 bytes
SHA-256: c8f83aa3e2dbafc2613bb25e64bcb13ff5d1ec47d62503a39b20332032c6b5cf

Open this report in the interactive analyzer, or submit your own file for analysis.