Malicious PDF — malware analysis report

Static analysis result for SHA-256 182ec8f6f452ec24…

MALICIOUS

PDF

83.6 KB Created: 2021-09-16 10:11:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f5959a0108a8230a47409425003c298f SHA-1: 4eda69ad4c9b1a7dd2756a55ed435c1c74a932d2 SHA-256: 182ec8f6f452ec2447d03ee47f734d7dd57793e1e05d8f3a86ccc25e432c0dc4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://infrive.ru/uplcv?utm_term=open+android+studio+from+command+line PDF link annotation
    • https://camphacement.vn/upload/files/96245357845.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/96862808944.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/jaxani.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/fajelekovafafu.pdfIn PDF document text
    • http://vswet.ru/f/90265792833.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/zajolulisojixurixipiza.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/42039902011.pdfIn PDF document text
    • http://www.mattig-accounting.bg/fisiere/file/lagawikoxisutivopojisaset.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/161343a0e435be---waganovobebalavanujew.pdfIn PDF document text
    • https://ka-base.no/images_content/file/80124353758.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/nomodixozalobe.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/c3bf6a4f06022ce7b243f3f1de6732ab/bifafemomimenowumedujebex.pdfIn PDF document text
    • http://chamdure.com/DATA/files/lelerozitadunib.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/95439046471.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/losamita.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109051551222019.pdfIn PDF document text
    • https://iword.de/userfiles/file/5950045363.pdfIn PDF document text
    • https://forumsevens.com/images/file/69772097233.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/jiwexezima.pdfIn PDF document text
    • http://emaaravm.net/upload/files/juxubafizaparujapozoluri.pdfIn PDF document text
    • http://ubest.ru/images/file/11051891876.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/84276757817.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_off0000e17f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF991 17516 bytes
SHA-256: 75cd00e632f83fa806cc499ec5813b46209830ea7c26ee2ba53050929a0194e5
font_02_sfnt_off000127a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A7 10908 bytes
SHA-256: 4918ca709c8e44b48d1363d3496a7c63d9808a5a12dbe20070e41f473cd7afb0

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