Malicious PDF — malware analysis report

Static analysis result for SHA-256 504881eef0506318…

MALICIOUS

PDF

87.4 KB Created: 2021-03-22 08:56:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 24e5ded04faa527550224b7e56b1ad30 SHA-1: 39d1d6408375c1e81f9fd31a6286574a7cd00ff5 SHA-256: 504881eef0506318dc1b967f85f289b7617a3eaa703fbade23c3108bebf72dea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document exhibits characteristics of a link farm, containing numerous external links to various domains, including disposable hosting. The ML classifier strongly indicates maliciousness, and the presence of a link to 'ponafet.ru' suggests a potential phishing or malware distribution vector. No scripts were extracted, but the document's structure and URL distribution point towards an attempt to redirect users to potentially harmful content.

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://ponafet.ru/wix?keyword=mastin+tibetano+precio PDF link annotation
    • http://vizilamu.22web.org/how_much_is_a_motherboard_for_a_hp_laptop.pdfIn PDF document text
    • http://gedawuxofawu.iblogger.org/how_do_i_change_the_fan_speed_on_my_furnace.pdfIn PDF document text
    • http://gachihyper.xyz/640995069yqynh.pdfIn PDF document text
    • http://nicepics.xyz/39669981728q3dfi.pdfIn PDF document text
    • https://gepidoduxaw.weebly.com/uploads/1/3/5/3/135324144/c1f932422d9a.pdfIn PDF document text
    • http://sk-anker.ru/drivers_license_for_undocumented_immigrants_in_new_jerseyas3gn.pdfIn PDF document text
    • http://zugikorudipeg.22web.org/ninja_professional_blender_1100_watts_pitcher.pdfIn PDF document text
    • https://degupapaji.weebly.com/uploads/1/3/0/8/130814014/1140669.pdfIn PDF document text
    • https://jamibada.weebly.com/uploads/1/3/1/1/131164428/a383d6177.pdfIn PDF document text
    • https://rejajosafijaba.weebly.com/uploads/1/3/4/5/134590771/kotevotogod_pinokiri_tivaxe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://99442e0c-e188-470f-b1e9-a2082f9e7f28.filesusr.com/ugd/2274a7_e4f3951188784db8895f2ffbcd7f6550.pdf?index=trueIn PDF document text
    • http://gugivuma.rf.gd/unit_6_lesson_1_relationships_between_quantities_answer_key.pdfIn PDF document text
    • https://3d3b31fc-6152-41c7-b1d4-a4af3afcce63.filesusr.com/ugd/3f8d85_60259fcade414595a4f1bfa12e3c315b.pdf?index=trueIn PDF document text
    • http://jumabesaguvun.epizy.com/mini_displayport_to_hdmi_dvi_dp_4k_vga_adapter.pdfIn PDF document text
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_c5991599c2454fef88604400b3ed27d0.pdf?index=trueIn PDF document text
    • https://ac4cd5cf-e861-4b1b-a585-e47049f737a6.filesusr.com/ugd/843280_c03285305be64d109d85bd585ac1b422.pdf?index=trueIn PDF document text
    • https://893c8be9-d140-4a04-8a3e-66bd54b472cd.filesusr.com/ugd/efd7ea_b9169d5271f845128a11fc31b2f95795.pdf?index=trueIn PDF document text
    • https://eaae50f7-3b1c-4f1b-9b3c-e2a48377569d.filesusr.com/ugd/b96e41_e34f9a7b6d1448ddb81abdaba7d832e2.pdf?index=trueIn PDF document text
    • https://3e1ae61b-6b68-46dc-8a90-d1c7a5b9f91c.filesusr.com/ugd/b8bbd7_f01dbed6a001494e9ff8d7e4c871b11a.pdf?index=trueIn PDF document text
    • https://a3720f92-bdaa-4449-a3ff-14f36884d2d5.filesusr.com/ugd/afadc3_29143fb36f3949c0a9ce1189e1680520.pdf?index=trueIn PDF document text
    • https://a2c67b61-a01d-4053-b7ad-f1487bca8054.filesusr.com/ugd/24853a_f57e028adf6247b0a1f35e0493ea3d78.pdf?index=trueIn PDF document text
    • http://faluzaxubip.epizy.com/bimimekawapax.pdfIn PDF document text
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_ff6000bb6bce4cf0b592d06dab3aa8b7.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f63d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63D 5040 bytes
SHA-256: 65d7ab65b759990009303885c90aa604d2e7bdc5bace6bd195b2f3ebf625c9f5
font_01_sfnt_off00010770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10770 10132 bytes
SHA-256: f6979e948fab277aa58f66d2202b5cd3b747b99da391d38f04b3b8c6f9bc4dee
font_02_sfnt_off00012825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12825 11776 bytes
SHA-256: cb8a6f4e26a4d314750a05bf7f49818f3280ef61f0ea572b141e70596295f9fb

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