Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d6bb6899bce802e…

MALICIOUS

PDF

81.8 KB Created: 2021-05-15 02:43:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 43e9eb571874acebe22cea01f6d9766b SHA-1: e18c0ddf9f1aafeffb637d075b19c6aaf7b80127 SHA-256: 6d6bb6899bce802e550ca25dc3fa5fd6ec1cc9fba662b34ccaa0385a8bf82b31
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDFs, suggesting a link farm or SEO abuse tactic. The primary external URI, 'https://nipisod.ru/strik?utm_term=maze+runner+4+book+pdf', is likely part of a phishing or scam campaign to entice users to download malicious content. While no scripts were directly extracted, the PDF structure and extensive linking are indicative of malicious intent, possibly to redirect users to exploit kits or further malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • 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.
  • 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://nipisod.ru/strik?utm_term=maze+runner+4+book+pdf PDF link annotation
    • https://puwilufe.weebly.com/uploads/1/3/1/4/131407694/joxivuzedakux.pdfIn PDF document text
    • http://doxugivo.22web.org/agriculture_class_10_extra_questions.pdfIn PDF document text
    • https://tidepobowajaxuk.weebly.com/uploads/1/3/0/8/130814761/53f60c6f46e92c6.pdfIn PDF document text
    • https://nuvarimo.weebly.com/uploads/1/3/1/3/131378817/sanogevilulixori.pdfIn PDF document text
    • https://wasefopepaseb.weebly.com/uploads/1/3/1/8/131856398/lubefibu.pdfIn PDF document text
    • https://wimelavejitovuv.weebly.com/uploads/1/3/4/5/134597731/pitapefa_vuvomem.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/dazawojob/tizevidelivo.pdfIn PDF document text
    • https://30621b86-6952-4b41-80af-4d24d830bc7c.filesusr.com/ugd/122077_b666d0cd00a94f28ba498ad815b676eb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/school_annual_day_invitation_format.pdfIn PDF document text
    • https://07e0a16e-b77d-475b-b724-88bbaedb347c.filesusr.com/ugd/8e9e2f_dc3336ed002b4c7b99fde9a5101ef2fc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lemerisinivum/5341033748.pdfIn PDF document text
    • https://s3.amazonaws.com/zijivevip/lajujapagutudusasorilag.pdfIn PDF document text
    • https://s3.amazonaws.com/potofaw/55166791293.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/11127003864.pdfIn PDF document text
    • https://995be609-08d3-41b1-a6c0-90e53670bcec.filesusr.com/ugd/9988e1_5b460de2c093485b86d48e2fc06e7eed.pdf?index=trueIn PDF document text
    • http://bufalirafuma.epizy.com/56507038399.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/broadsheet_sydney_surry_hills_restaurants.pdfIn PDF document text
    • https://901c4554-6fda-40bf-8344-1f1538f5dc06.filesusr.com/ugd/a76634_fd8216b58f88400eaee36e4c73d42e2b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/dyson_dc41_animal_vacuum_parts.pdfIn PDF document text
    • http://vijanemafe.rf.gd/muxepanojub.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/biodynamic_compost.pdfIn PDF document text
    • http://nivodonugito.rf.gd/zaguturovosaguvedosewo.pdfIn PDF document text
    • https://s3.amazonaws.com/runuzitexokol/xutidogadexajebuze.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_off000102f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F4 5172 bytes
SHA-256: 01943fe3c3237bb8e54c61cf87109ba0099bc7e443f812893779e6d12512e5d0
font_01_sfnt_off000114ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BA 10872 bytes
SHA-256: c2c110f1ce7324e4e5744fca002072120684bf91f2d1d845c86437ef7e1e3b21

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