Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2ebb5568f1d8547…

MALICIOUS

PDF

83.3 KB Created: 2021-05-22 08:01:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 06e10ce345f962c20c686512f74a8451 SHA-1: 71cb544b9d58e16cc3500d8684d25446ca76a3c9 SHA-256: c2ebb5568f1d85479423962343611eddeb5ec20c83f919941513c599dd6c2969
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF link farm'. The primary external URL points to a domain associated with potentially malicious activity. While no scripts were directly extracted, the PDF structure and the presence of embedded URIs suggest an attempt to redirect users to external content, possibly for SEO spam or to host further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://leonvi.ru/strik?utm_term=explain+the+race+condition+in+operating+system PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418762/normal_601391e29f4ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481170/normal_5fd67c8ce77e5.pdfIn PDF document text
    • https://pitalozel.weebly.com/uploads/1/3/1/3/131384414/nulub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421776/normal_603576cc7d9ff.pdfIn PDF document text
    • https://nudabixe.weebly.com/uploads/1/3/4/5/134505388/7824887.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369935/normal_5fd77caaa38de.pdfIn PDF document text
    • https://lojopozubog.weebly.com/uploads/1/3/1/6/131606756/fuvuw-gakes-suxuzojiziz.pdfIn PDF document text
    • https://kuledeju.weebly.com/uploads/1/3/0/7/130775905/1613119.pdfIn PDF document text
    • https://gikatufezido.weebly.com/uploads/1/3/4/3/134338368/xuberekepoxiza_kevogufo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427785/normal_604424cdea387.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/wurivuve/jasoda_sarkar_video_baul_song.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/71644058793.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/58832342492.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc5d7dae-ba01-4bee-80fb-87941ae43693/46143531241.pdfIn PDF document text
    • https://s3.amazonaws.com/batoragubukepo/jijonoviranixu.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/single_complete_denture_case_report.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/2004_dodge_ram_1500_wheel_torque_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd470deb-33e4-4dc9-947d-91a2e9686dbc/waropovunixumapazekaza.pdfIn PDF document text
    • https://s3.amazonaws.com/rizoli/presto_dehydro_digital_electric_food_dehydrator_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/ximupuv/purble_place_game_windows_8.pdfIn PDF document text
    • https://s3.amazonaws.com/wovisak/geometric_progression.pdfIn PDF document text
    • https://s3.amazonaws.com/jawusawar/rigilolap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/978f4f6b-c046-4936-8312-37f242431211/football_play_editor_free.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_off000104cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CF 5616 bytes
SHA-256: 7ac53defd9cd78d05b1a020684ee2bf72f52c0a415d0dbd0a90bbaf5555b8567
font_01_sfnt_off000117cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CB 11564 bytes
SHA-256: 79ee4e9e73614a95f74b63280796c4645aaded3784fe5941cd330ed67d5764da

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