Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6f56887290749d1…

MALICIOUS

PDF

76.5 KB Created: 2021-03-25 02:52:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: bfb733f4a555d57ef1eddf3060123c38 SHA-1: 6cf89fcfa5c0df7336515a5545f6056973fa916c SHA-256: c6f56887290749d187c6d62fca5fc084ea21f26e38faac55bf7da7ea9e0acdf5
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by 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 0.9991

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://resalured.ru/award?keyword=oceans+hillsong+lyrics+pdf PDF link annotation
    • https://duwesokele.weebly.com/uploads/1/3/1/6/131606866/01a5111a.pdfIn PDF document text
    • https://nifakisafuzum.weebly.com/uploads/1/3/0/7/130775286/xesinojip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484122/normal_603e977923582.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449170/normal_6002213af2fb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471971/normal_604b16f1a4b64.pdfIn PDF document text
    • https://xurugafidas.weebly.com/uploads/1/3/6/0/136081795/5537867.pdfIn PDF document text
    • http://tipofeliluget.medianewsonline.com/motorboating_merit_badge.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488581/normal_601c0345dedf0.pdfIn PDF document text
    • http://kofojoxake.mygamesonline.org/asta_fantacalcio_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501632/normal_604c98411c938.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c0b8f06b-4e98-4d3d-89ef-2f08caba629a.filesusr.com/ugd/0c8cc8_d3468564965e4f79920346f1272846ca.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/gout_cookbook_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73d483f3-77ed-4548-967a-d569dd942539/89241307794.pdfIn PDF document text
    • https://cb6d8354-940b-4e05-9f1d-0150973ab277.filesusr.com/ugd/882da0_35c5295e95bf4e98a18c1d276765ca4f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/44626152065.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/azimuth_and_elevation_angle_calculation.pdfIn PDF document text
    • https://s3.amazonaws.com/fizufapu/bourke_s_luck_potholes_information.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7490a4d4-dfea-4433-90c5-4a2c98b85d60/operations_management_undergraduate_programs.pdfIn PDF document text
    • https://s3.amazonaws.com/luropi/beach_head_2020.pdfIn PDF document text
    • https://ce83042b-5faf-46b5-bcbb-9b4d05ec7d33.filesusr.com/ugd/a31856_bf0115acc8b94b839b2a805b7e6cb1f3.pdf?index=trueIn PDF document text
    • https://8a5a474a-a671-4857-921d-d1df0ee72544.filesusr.com/ugd/523716_730a1dbfce4a4302a28059a4d8552bff.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/15292eb9-a112-43af-95b0-acc9ca1c2ce9/proofs_using_special_angle_pairs_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c198293-442c-41f0-a9ff-cccda8a2df05/36537193195.pdfIn PDF document text
    • https://ec8c99fd-5413-4e38-b6a0-2ccbba71fc6f.filesusr.com/ugd/de02f3_047af861f98e4479877eb6428e2184c8.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_off0000eb5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5C 5544 bytes
SHA-256: f0f82813f2394ccf9176662729aa0b16778ff79671bd4ccf33ab235755835856
font_01_sfnt_off0000fe33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE33 10780 bytes
SHA-256: 2d488df0e638094bd0fb447c2e007e1589dea986ea38e3f0c2648409a0d84127