Malicious PDF — malware analysis report

Static analysis result for SHA-256 e261bc5186fb61fb…

MALICIOUS

PDF

143.1 KB Created: 2021-03-12 17:51:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 2878270a85f8ca39a2f90a5db0abb9d0 SHA-1: c9329196c6eff416d9f06b2ddde6c5ca488bb9ef SHA-256: e261bc5186fb61fbf5322c6f81b7e7ba571d6d47812a9d087f2ab0ee4d3c4f93
126 Risk Score

Malware Insights

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

The PDF document is identified as malicious by ML classifiers and ClamAV, and contains numerous external URLs. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is part of a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the overall structure point towards a spearphishing attachment, likely designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://druttle.ru/wix?keyword=nova+race+for+absolute+zero+worksheet+answers PDF link annotation
    • http://nonretloli.site/barbados_immigration_department_passport_formsibus7.pdfIn PDF document text
    • http://vnds-super.space/excel_vba_get_last_row_with_valueo55s3.pdfIn PDF document text
    • http://spiritstudio.ru/wuwupiwego305oj.pdfIn PDF document text
    • http://libralab.digital/27587508561cn0u2.pdfIn PDF document text
    • http://trynutra.shop/software_testing_coordinator_job_descriptionp2m0v.pdfIn PDF document text
    • http://apkweb.net/46630289458dzs3t.pdfIn PDF document text
    • http://promooffer.site/78645113679kialb.pdfIn PDF document text
    • http://lassituda.online/61361282ke5eg.pdfIn PDF document text
    • http://health2health.online/mitologia_celtasxmr9.pdfIn PDF document text
    • http://idealica-official.website/memusisisitojuvatew0kgxw.pdfIn PDF document text
    • http://acgmgroup.ru/tie_dye_kit_joannmi2rk.pdfIn PDF document text
    • http://sesalon.xyz/chrisette_michele_songs_freekcv4x.pdfIn PDF document text
    • http://letxxnx.org/orvis_encounter_fly_tying_kit_video_instructionsmlyt9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c99434fd-e2cd-4bc5-951d-3d790d71de02/69472844947.pdfIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/jofipibuvepuki.pdfIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/la_divina_commedia_espaol.pdfIn PDF document text
    • https://5634f520-c25d-421d-ab67-3d94505d13cb.filesusr.com/ugd/1b85ab_ea931223c0c34d9ab409344235698453.pdf?index=trueIn PDF document text
    • https://9764c975-acb6-4bd5-a3ff-b1f4624bc9bc.filesusr.com/ugd/5bcb7b_6dbd335c99384a32b08e85a031d34108.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2287ab9b-a48a-43f7-ad05-993c7cb0bc85/zorawarivafedo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d338c209-48cd-4710-b686-c97ed05a1794/how_to_update_webos_lg_smart_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/tosego/48697296194.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efef3b9e-2fe3-4c2f-a88d-e88340e171e3/visigoji.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/norcold_control_board_reset.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_off0001f708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F708 5344 bytes
SHA-256: 13d6e00c13703cffc58453509c6af82fecd98404ba58ccc267604b9a502d2026
font_01_sfnt_off00020959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20959 10936 bytes
SHA-256: b9a70dc43423b25d840ec6c1ea1d06b067d272e70320b917fb0101eb5c6a33ad

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