Malicious PDF — malware analysis report

Static analysis result for SHA-256 00457f9857edae3b…

MALICIOUS

PDF

82.2 KB Created: 2021-03-10 08:39:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 1f6678ffb1e60e0a7073e1f3276f3078 SHA-1: 2910bba3887a83afa7fb1dfe9504491f6805ad3f SHA-256: 00457f9857edae3bb8080b7c2ba55f9a4d13796b904b46448ab2b0204aba94a8
126 Risk Score

Malware Insights

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

The PDF file contains a large farm of external links, many hosted on disposable domains, suggesting a link-farming or SEO manipulation scheme. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs points towards an attempt to redirect users to potentially harmful content. No scripts were extracted, but the overall structure and heuristic firings are highly indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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://seumenha.ru/aws?utm_term=how+to+program+uv-5r+with+chirp PDF link annotation
    • https://biwomewiwuxe.weebly.com/uploads/1/3/4/1/134131409/bulagin-fazevokomafeb.pdfIn PDF document text
    • https://wujojebexubab.weebly.com/uploads/1/3/1/3/131380870/b985dcaa93.pdfIn PDF document text
    • https://dazuvekojuj.weebly.com/uploads/1/3/4/8/134863877/22c07b0.pdfIn PDF document text
    • https://romigugegis.weebly.com/uploads/1/3/1/3/131384185/xolenojelezaz_xogajolal_gimofozage.pdfIn PDF document text
    • https://losebevaxefot.weebly.com/uploads/1/3/5/3/135347065/pizosuwama.pdfIn PDF document text
    • https://vanuludegevu.weebly.com/uploads/1/3/0/7/130776818/9536560.pdfIn PDF document text
    • https://jedufopev.weebly.com/uploads/1/3/4/4/134490540/7915732.pdfIn PDF document text
    • https://lepuzabokagat.weebly.com/uploads/1/3/4/3/134333079/968f938f47.pdfIn PDF document text
    • https://bapuporodotuxo.weebly.com/uploads/1/3/1/3/131381531/fd0a1449955c.pdfIn PDF document text
    • https://fuvekusegubo.weebly.com/uploads/1/3/4/7/134736786/622222.pdfIn PDF document text
    • https://kuxapularutamux.weebly.com/uploads/1/3/5/9/135984678/27174b7032c76bd.pdfIn PDF document text
    • https://nibuwoxemunovox.weebly.com/uploads/1/3/4/7/134714338/4e90f86a22d78.pdfIn PDF document text
    • https://zofudugopevemob.weebly.com/uploads/1/3/1/6/131607066/0cfeac66f372.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a40b6db0-1679-4e03-879f-ac5827b9aa7d.filesusr.com/ugd/dba42a_bb90b1a05f884a068d9dee5016653b8d.pdf?index=trueIn PDF document text
    • https://f74ea38a-ab8d-49a0-8d31-9a1d7ce64423.filesusr.com/ugd/5ceade_6b4cb6d3be3e44799d182e403185c97e.pdf?index=trueIn PDF document text
    • https://b1f0a730-f0e4-4bcf-918d-a915077b90d0.filesusr.com/ugd/a7c69d_f530509eb9af4f9d957667a501482175.pdf?index=trueIn PDF document text
    • https://b8436764-02b3-4471-8711-1e8fed235cf0.filesusr.com/ugd/3b3fbb_bdaf9e3cdb7c49808fe9affeca69557d.pdf?index=trueIn PDF document text
    • https://6c8027e1-9878-41b3-a9ef-32ba2b6bcd02.filesusr.com/ugd/185811_fd0096a835dc4710bff265679992f3e5.pdf?index=trueIn PDF document text
    • https://60659a61-a27b-47ea-8eac-a81775c62269.filesusr.com/ugd/7a7fb1_64b61b9a34874c00b8be3b66078ac56a.pdf?index=trueIn PDF document text
    • https://8eeb1f0a-0cdd-4c66-98a4-83777b49fb54.filesusr.com/ugd/64f9d2_4d46746b39c043c382ece8d98bd86d6b.pdf?index=trueIn PDF document text
    • https://df9240ce-57b4-430e-a582-521170ca5232.filesusr.com/ugd/10b03a_594cb3ee588f4b3c922ff61026c58820.pdf?index=trueIn PDF document text
    • https://e082b6be-64c0-45f6-a8ff-82b9c6f476f0.filesusr.com/ugd/1479de_cf63d5ec7b1f4554974396b4dc040a0b.pdf?index=trueIn PDF document text
    • https://748f1d53-d141-46c1-926a-d14fc69713a3.filesusr.com/ugd/e3ed1f_a1a0a5f1c19f447fbc2c5a66a8ed1ecb.pdf?index=trueIn PDF document text
    • https://ced6af22-cf5f-4df0-9cd6-2d424634d287.filesusr.com/ugd/3eed2b_265bcfa2850845db89d5df8b344fc5b0.pdf?index=trueIn 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_off0000fa74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA74 5404 bytes
SHA-256: cf8b364a27deb1a776a61e775b80abcc25e05e477ede7025627d837302a1f583
font_01_sfnt_off00010cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDB 14988 bytes
SHA-256: e5284f87694548685ef3b8f08e0deccc4e704cd2d50d3f75e86bd6d4d9f474c6

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