Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa51cd4c45cd7853…

MALICIOUS

PDF

84.1 KB Created: 2021-09-19 09:36:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0ce52b8e21481d8d31f0c5561ad4900c SHA-1: f46377945235e94cbfc82230fc6e5a7cc808bb8c SHA-256: aa51cd4c45cd7853ec7c862f5b7482fd7fd6e758292220e37c66f3fd28341cd0
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple heuristics indicating malicious intent, including a direct link to an IP address and a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest this is a malicious phishing or trojan PDF. The primary IOC is the IP address hosting a secondary PDF, likely containing the final payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://gegeny.hu/uploads/file/56063724748.pdf In PDF document text
    • http://uklearningnetwork.com/userfiles/file/73459392054.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/18204178443.pdfPDF link annotation
    • https://zivotzaokny.eu/res/file/32015451950.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202109130708282435.pdfIn PDF document text
    • http://craft-personal.de/userfiles/file/fumogesomafosugem.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/nisurajopadukexuxuzub.pdfIn PDF document text
    • https://hotelgaric.com/upload/datoteke/fiboxikoxosomoxar.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613767b24aad4---nijipunezugafumosuwolap.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/lezifoxobaga.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/dikuzubijegudobojafuxev.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/92217180796.pdfIn PDF document text
    • http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/silesitazi.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/53669056413.pdfIn PDF document text
    • http://xn--80aaaaadfwa5aftjhxrkcrg8iwc.xn--p1ai/pict/file/bufewates.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/lajubijusawini.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/virutepa.pdfIn PDF document text
    • https://mimpiindah1.com/contents/files/61394590872.pdfIn PDF document text
    • http://greenglobepms.com/uploads/18332138489.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/titef.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/virepudokenazakupifarulop.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/42414478592.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=my+war+roblox+idPDF 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_off0000e573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE573 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD85 17804 bytes
SHA-256: ed43db294b52e7c5737b535eae9942a2cbfddc75648d4b3b433afa97801151a1
font_02_sfnt_off00012c61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C61 10172 bytes
SHA-256: 6f994b77114ecde65e5e37eb6229cc47e0c36221699da318ab0a5ecd45052914

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