Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c789c7f398e701b…

MALICIOUS

PDF

81.4 KB Created: 2021-05-22 22:58:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 836a679af9101d5a3ef07c2a8d7d2800 SHA-1: eb8b010d7ca1eb9aa9cf444ce3adefe6406f1cc9 SHA-256: 2c789c7f398e701ba145f419325361489d8bbe28d094e6eeca2f6415a014034d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://mezovuduw.ru/strik?utm_term=flora+fauna+y+caracteristicas+de+la+taiga PDF link annotation
    • https://roturusuwanowus.weebly.com/uploads/1/3/4/3/134363773/f929881dc9a31.pdfIn PDF document text
    • https://nedidibizexoba.weebly.com/uploads/1/3/0/9/130969065/lerasufibo.pdfIn PDF document text
    • https://muxiduxipa.weebly.com/uploads/1/3/5/3/135319221/db4ea490d06ef.pdfIn PDF document text
    • https://xazupuve.weebly.com/uploads/1/3/4/8/134863790/7927904.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527357/normal_604cd9154cee0.pdfIn PDF document text
    • https://titoboxe.weebly.com/uploads/1/3/0/8/130874676/tadukezosa_fonudedewiz_nadebutebeb_disiv.pdfIn PDF document text
    • https://motoburibekisi.weebly.com/uploads/1/3/4/6/134623685/ruvapirawaxal.pdfIn PDF document text
    • https://pudoxarunisit.weebly.com/uploads/1/3/1/1/131164251/1578c87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478669/normal_601a84dc9426b.pdfIn PDF document text
    • https://wabobileminila.weebly.com/uploads/1/3/5/4/135400898/metakajulebo_tinoxefudezufi_wukijonup_mobov.pdfIn PDF document text
    • https://jetapixivokob.weebly.com/uploads/1/3/4/7/134726526/874c71.pdfIn PDF document text
    • https://werevofapopaja.weebly.com/uploads/1/3/4/4/134492388/0b2913dcc6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497346/normal_600d6d318d2b3.pdfIn PDF document text
    • https://wozizagozesa.weebly.com/uploads/1/3/4/8/134848764/xexekuju.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/widiku/internship_report_example_architecture.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3790ccd3-b478-4986-9774-2e74b8230fe4/movies_like_lord_of_the_rings_and_the_hobbit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dab964f-2cba-4d4e-886b-df9b27722e3b/kewojofopabutufizoviju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c01c0458-d667-460a-bb35-c357b77b64b3/cloud_of_unknowing_modern_english.pdfIn PDF document text
    • https://s3.amazonaws.com/neporezofov/93562623582.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6E 5244 bytes
SHA-256: ace4b57e63615191c3fbd83122a59baf11baa2aeaad3455dc31e18b62be9d606
font_01_sfnt_off00010f61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F61 12076 bytes
SHA-256: 2b129c3015e70a2a0f3a9bfac7f5b9af3b3c57d0d3fee8590ed40f2cb4155137

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