Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9e5ba8d7d154289…

MALICIOUS

PDF

48.6 KB Created: 2020-10-01 11:06:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ec133178dd3f7fc57b9e8827291bad99 SHA-1: 7c9d9fd0ede77f6b127e208cef6af4458b189784 SHA-256: b9e5ba8d7d1542895c54682c391c9beedbac5194495effaad81d705e0b667b6c
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on disposable domains. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting the document is used to distribute malware or engage in phishing. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/strik?keyword=system+administrator+roles+and+responsibilities+pdf In PDF document text
    • http://files.joannajensen.com/uploads/1/3/1/6/131606636/kabidofexopuvik.pdfIn PDF document text
    • http://muwerafos.babymoonshine.com/uploads/1/3/0/7/130775200/saleka.pdfIn PDF document text
    • http://vewijozot.hillsideumcgoffstown.org/uploads/1/3/2/3/132303072/3028775.pdfIn PDF document text
    • http://voniram.atomicartcompany.com/uploads/1/3/1/4/131407408/pepetugitimerepefonu.pdfIn PDF document text
    • http://files.itsmypartycelebration.com/uploads/1/3/1/4/131483138/075930.pdfIn PDF document text
    • https://site-1038622.mozfiles.com/files/1038622/nakesekagetetudap.pdfIn PDF document text
    • https://site-1036651.mozfiles.com/files/1036651/ninarevi.pdfIn PDF document text
    • https://site-1036742.mozfiles.com/files/1036742/tulozerezazudipuge.pdfIn PDF document text
    • https://site-1038431.mozfiles.com/files/1038431/vixorovolivax.pdfIn PDF document text
    • https://site-1036734.mozfiles.com/files/1036734/jewitutetuzejowudapuzi.pdfIn PDF document text
    • https://site-1036868.mozfiles.com/files/1036868/64286686247.pdfIn PDF document text
    • https://site-1039658.mozfiles.com/files/1039658/peviradibejinawedo.pdfIn PDF document text
    • https://site-1036876.mozfiles.com/files/1036876/71687296826.pdfIn PDF document text
    • https://site-1036724.mozfiles.com/files/1036724/91155718586.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00007484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7484 5532 bytes
SHA-256: 8ff20a0f4954a8bd5994019bbbf18ac9a85f56d884121b0be185eb1beb2e537f
font_01_sfnt_off00008739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8739 15076 bytes
SHA-256: 5d3e2e4a1f25eb540f6ab620a17c135c003b0da991398efd5bf37461e4eff77b

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