Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ccf00071a4f244a…

MALICIOUS

PDF

72.9 KB Created: 2021-06-09 17:28:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 446301c2e89f8530b6b2f48615b1086f SHA-1: 64e2ebe1e8f2a01a6e89a6e11d840f288b920e21 SHA-256: 2ccf00071a4f244a623548a8ed80e375c94efb8a8a0b392ddc8c61ae09e17729
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO poisoning or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. While no scripts were explicitly extracted, the PDF structure and embedded URI heuristics suggest it's designed to drive traffic to external resources, likely for further exploitation.

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://medvor.ru/pbw?utm_term=active+and+passive+voice+conversion
    • https://cdn-cms.f-static.net/uploads/4491173/normal_603fa45bbf5d6.pdf
    • https://wivirupi.weebly.com/uploads/1/3/4/6/134666213/xaxidu.pdf
    • https://cdn-cms.f-static.net/uploads/4415061/normal_6033c5c9b9c42.pdf
    • https://supimoxu.weebly.com/uploads/1/3/5/3/135319300/mofanizujan.pdf
    • https://vuzeruferule.weebly.com/uploads/1/3/4/5/134591890/detolivokun.pdf
    • https://poxofosu.weebly.com/uploads/1/3/4/3/134308827/2882437.pdf
    • https://cdn-cms.f-static.net/uploads/4460694/normal_603e8082599c5.pdf
    • https://static.s123-cdn-static.com/uploads/4414848/normal_5ff2b1eec6f79.pdf
    • https://cdn-cms.f-static.net/uploads/4374533/normal_603b19f3abcc5.pdf
    • https://cdn-cms.f-static.net/uploads/4383922/normal_605c9ae5885d9.pdf
    • https://kotuvowomikek.weebly.com/uploads/1/3/4/3/134370123/tifawosavakovivub.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8956df43-bc5f-4ef9-9f92-97b641e35008/pathfinder_kingmaker_elven_curve_blade_duelist.pdf
    • https://uploads.strikinglycdn.com/files/c9511582-d43f-4e25-aff8-7f811a298f6d/when_is_free_pet_adoption_day.pdf
    • https://uploads.strikinglycdn.com/files/3345869f-77f0-4294-836c-5843def99f67/first_cell_height_calculation_cfd.pdf
    • http://lipovosufuk.pbworks.com/f/money_glitch_hill_climb_racing_2.pdf
    • http://luwivaj.pbworks.com/w/file/fetch/144517446/29599476463.pdf
    • https://uploads.strikinglycdn.com/files/c7dfcee8-fa02-4f2b-86b9-be96be40d2ba/droite_demi_droite_segment_6eme.pdf
    • http://fesabijege.pbworks.com/f/combine_docs_into_one.pdf
    • http://saladolu.pbworks.com/f/walking_in_a_winter_wonderland_trumpet_sheet_music.pdf
    • http://fepewuwakow.pbworks.com/f/kingdom_rush_origins_hacked_all_heroes_unlocked.pdf
    • https://uploads.strikinglycdn.com/files/53308e3f-1e7d-4cc2-b02a-e78064a8a004/what_is_a_scatter_plot_graph.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_off0000e386.bin
d96247ee27ddff91281d6c6942ffb989df1c9d9ac45b1ff04500d9d781a2f5e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE386 5084 bytes
font_01_sfnt_off0000f4e6.bin
be8f61d5e363e43bc8f55ea66bfa6e2d01c3aae8c4e011fd937852de331fe24b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E6 9820 bytes

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