Malicious PDF — malware analysis report

Static analysis result for SHA-256 df7837c0d17e2603…

MALICIOUS

PDF

85.8 KB Created: 2021-05-06 12:42:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01836cf42b7ee6e893e81567f2fd4ae9 SHA-1: 2aea736e80c92909c40268e8a68c433a53bcca6d SHA-256: df7837c0d17e260388a5e2447a1980068ab9ce3d8fc19f534a9c8059a9202f35
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files, suggesting a link farm or distribution mechanism for malicious content. The primary malicious URL identified is http://rimka.xyz/kifawixijimixexamr6m.pdf, which is likely used to host or redirect to a malicious payload. The presence of PDF-specific heuristics and ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/strik?utm_term=how+to+disassemble+maytag+bravos+xl+washer
    • http://rimka.xyz/kifawixijimixexamr6m.pdf
    • http://barberking.best/rapid_spanning_tree_protocol_wikipedia66koz.pdf
    • http://sebevifa.getenjoyment.net/principles_of_physics_11th_solution.pdf
    • http://pejazadajenatew.getenjoyment.net/24628859106.pdf
    • http://kavelokafozi.medianewsonline.com/ackerman_s_account_application_form.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6674166f-eb58-46b1-9d38-a528bc95e02c.filesusr.com/ugd/e38d8e_1aa64ce561524df2a76c638c19f337ed.pdf?index=true
    • https://s3.amazonaws.com/zusevamasor/hp_color_laserjet_cp1215_service_manual.pdf
    • https://091a8774-b5bd-4fb7-8799-8d1ca0ca44ad.filesusr.com/ugd/8716ab_35bf73e32cbb47bea7dcd01983733b85.pdf?index=true
    • https://4993f9ff-345c-4c03-a8ec-d4f8dac664d6.filesusr.com/ugd/debbe1_0714a927d9c945f7a0e05d80d4e3c2b1.pdf?index=true
    • https://1cd0d4d5-11d4-440c-a307-81f73801f601.filesusr.com/ugd/f0e51d_847fea9b55fa49f0aa2c934ac35984f4.pdf?index=true
    • https://2225f16e-b6a0-48e2-a067-d7e802b71dd4.filesusr.com/ugd/a7ada4_0164c7a31da24031a38689a253e9dcc3.pdf?index=true
    • https://ececae0b-1312-4a4c-959a-117928b3d478.filesusr.com/ugd/e6721e_5267dadcde0e49f2a06f32407f9f24d2.pdf?index=true
    • https://s3.amazonaws.com/wegemebufojafak/weather_report_fernandina_beach_florida.pdf
    • https://s3.amazonaws.com/jolozidabi/resumen_de_la_obra_trabajos_de_amor_perdidos.pdf
    • https://8dac4d01-2cd1-45d2-8b5f-6005f802adc9.filesusr.com/ugd/1f96ce_fdccd8c7d47c4089888368ecb21641db.pdf?index=true
    • https://s3.amazonaws.com/nafamaragisek/9363343312.pdf
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_af183aab6c7043999731048cf49fea37.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b50f5709-71c1-4891-b0b8-9e6d02254f6a/94321050853.pdf
    • https://s3.amazonaws.com/tarizirefevifab/apowersoft_phone_manager_full.pdf
    • https://uploads.strikinglycdn.com/files/af4568cc-5934-4d1c-9f3a-31c27596af0b/what_is_the_meaning_of_cf_in_samsung_ac.pdf
    • https://uploads.strikinglycdn.com/files/c139f388-03ea-49ad-abdc-42dc05c6de50/kupox.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011038.bin
d488e4c769c06b3d769c7477d418015045ebe318fec949e8f9124264a0c93fba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11038 5660 bytes
font_01_sfnt_off00012366.bin
a66037ee53cc56ef67ae6384fec77d3c7c77bff084eb4f7f739f21666066364b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12366 11432 bytes

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