Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7148b8a12a4f0f3…

MALICIOUS

PDF

77.2 KB Created: 2021-03-05 11:54:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 5fdcb0d7cae3661fa43ca962f2079ed2 SHA-1: 4f8db7a8dfb58c5c02515b3b418ebb26907ad6bb SHA-256: d7148b8a12a4f0f3b2af94ebe1524bb798b99b5a7704aea3340d11a061fcce07
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external links, identified as a link farm, with one primary URL pointing to 'seumenha.ru'. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a large number of links, suggesting an attempt to manipulate search engine results or direct users to potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/wix?keyword=importacion+de+vehiculos+a+usa PDF link annotation
    • https://cdn.sqhk.co/sujoxeti/e4ignjg/automaton_transfusion_2.pdfIn PDF document text
    • https://cdn.sqhk.co/viwedanej/SJNWJgi/95603723350.pdfIn PDF document text
    • https://kidudowo.weebly.com/uploads/1/3/4/3/134318554/09005e964a.pdfIn PDF document text
    • https://cdn.sqhk.co/lojadisexudo/dThaGif/extreme_loner_synonym.pdfIn PDF document text
    • https://cdn.sqhk.co/dilizilozok/VCiguia/jurusidegaverawobe.pdfIn PDF document text
    • https://xewixubigikuj.weebly.com/uploads/1/3/4/8/134892453/lubaxi-gojut.pdfIn PDF document text
    • https://vazanopika.weebly.com/uploads/1/3/4/8/134896022/pafepojukizawas_taleduxubawowug_bitilugirep_kawexes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f405dec1-7f90-4f4c-a861-5286f67d0127.filesusr.com/ugd/ab922d_043ad9b9809e4b85b38551ccf745a23a.pdf?index=trueIn PDF document text
    • https://6d4cd3b7-91e9-43ac-92b9-205473f1e50d.filesusr.com/ugd/28146e_f9fd4389a66f431a87b57f199eb0361b.pdf?index=trueIn PDF document text
    • https://cc968bdf-8a18-4a65-a72d-893c706ef441.filesusr.com/ugd/bae363_0a54ca66717644e587535db85e7cbdd6.pdf?index=trueIn PDF document text
    • https://8a89c5bc-485b-4808-980c-66c60e8d9908.filesusr.com/ugd/834936_222beed05bc94859b89333d960e87a44.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wexukufedepim/8828911592.pdfIn PDF document text
    • https://bef89f6e-6323-4b84-ad9d-a44490bfcc4f.filesusr.com/ugd/96768c_2400de19187e4b6194611e03a608b17a.pdf?index=trueIn PDF document text
    • https://411be8f8-4ba1-40b5-9edf-cc4a2c3d5ecc.filesusr.com/ugd/a86d68_29e045cfc1d14449aa364ca0cb4f16f9.pdf?index=trueIn PDF document text
    • https://ac263381-fdad-4fda-ae78-6df6d71032d6.filesusr.com/ugd/25c42e_9a92f6f5291c4589b337646ad43a9b77.pdf?index=trueIn PDF document text
    • https://d80868e2-5d34-4dda-9345-0396294a35aa.filesusr.com/ugd/f9fac6_29db904700a34025926802d78f50cf10.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xarojapi/john_green_looking_for_alaska_movie.pdfIn PDF document text
    • https://a2ae8793-a99f-480d-a3bc-849ef63d34f7.filesusr.com/ugd/cc207a_77ccce9417b14e2dbe8bf2ceb9fec078.pdf?index=trueIn PDF document text
    • https://e5447efa-8854-4d04-834e-f0bbd7438c8b.filesusr.com/ugd/ac612b_b1c60bd10da649d1b4605ec6c1eec6d4.pdf?index=trueIn PDF document text
    • https://dc273c12-e125-4738-b2e6-b96bc4bd5eb7.filesusr.com/ugd/c8df25_35188a03850e443cbcb46fc558fad430.pdf?index=trueIn PDF document text
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_cc9a2691b5484e4e94240e3986fcfd0f.pdf?index=trueIn PDF document text
    • https://486a928f-df87-4682-b39c-9199637d78f9.filesusr.com/ugd/982a49_00901cd42d284b0c8ce3c175c23fb1e1.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_off0000edf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF6 5312 bytes
SHA-256: 019350b2084e985ec51a2f98a82d9ba0c6632a0d557e45f08ff6c83e8a82543b
font_01_sfnt_off0000ffd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD8 12124 bytes
SHA-256: 3d034e8e3ae7e3e9eaf76120dcfbb41984f942c30e4dd778509d798d9735e492

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