Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e5d8de96e76dd31…

MALICIOUS

PDF

114.3 KB Created: 2021-06-03 11:41:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8948f3dce6f2b6450a9ff95efd7affbb SHA-1: 552b6e74d1b0e7f1ab590bc35086cb0da3601ff4 SHA-256: 6e5d8de96e76dd317415e0bbacdb859473f913502263f789a6196c37b3c48aba
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, and is flagged by ML classifiers and ClamAV as malicious. The document body, though corrupted, suggests a lure related to "Los primeros presidentes de colombia" to drive traffic to these links. No scripts were extracted, but the presence of numerous external links indicates a high likelihood of redirecting users to malicious sites or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://cructi.ru/pbw?utm_term=los+primeros+presidentes+de+colombia
    • https://cdn-cms.f-static.net/uploads/4367950/normal_6039e2a6a6ab2.pdf
    • https://cdn-cms.f-static.net/uploads/4455672/normal_605c3e67f3c51.pdf
    • https://static.s123-cdn-static.com/uploads/4385852/normal_5ff08802b55e7.pdf
    • https://cdn-cms.f-static.net/uploads/4366036/normal_6067c20c28d3e.pdf
    • https://cdn-cms.f-static.net/uploads/4454300/normal_6069109935508.pdf
    • https://cdn-cms.f-static.net/uploads/4378641/normal_5fd19e5028fc8.pdf
    • https://verorepu.weebly.com/uploads/1/3/4/7/134774070/sivesipodis.pdf
    • https://tiralilibixadu.weebly.com/uploads/1/3/4/5/134500138/wejewibozosip_mipad_supesurifitet.pdf
    • https://cdn-cms.f-static.net/uploads/4490542/normal_604034b567962.pdf
    • https://cdn-cms.f-static.net/uploads/4460465/normal_603a7b8a61f81.pdf
    • https://static.s123-cdn-static.com/uploads/4481520/normal_5ffa2a3a342b0.pdf
    • https://bipixexomalexu.weebly.com/uploads/1/3/4/3/134349320/7fb42407b.pdf
    • https://static.s123-cdn-static.com/uploads/4392218/normal_5fc8c37dbc56e.pdf
    • https://static.s123-cdn-static.com/uploads/4453560/normal_5ff6bda30acee.pdf
    • https://woduberorakemam.weebly.com/uploads/1/3/4/6/134667752/wijatizu.pdf
    • https://static.s123-cdn-static.com/uploads/4491925/normal_5fce5a2ab7230.pdf
    • https://cdn-cms.f-static.net/uploads/4499622/normal_606ac54e3357f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kibumezi.pbworks.com/f/temple_run_2_frozen_shadows_mod_apk_unlimited_coins_and_gems.pdf
    • http://mutatalibo.pbworks.com/f/what_are_the_four_effects_of_baptism.pdf
    • http://jesababa.pbworks.com/f/how_many_combinations_with_5_numbers_1-45.pdf
    • http://noxiwako.pbworks.com/w/file/fetch/144515058/guitar_hero_3_songs_cheat_wii.pdf
    • http://mujefapufefi.pbworks.com/f/how_to_bot_on_pokemon_go.pdf
    • http://ropotupi.pbworks.com/f/fujakavobowadoxakirilela.pdf
    • http://dadilotofexi.pbworks.com/f/romagajoganewidigotuw.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_off00017f10.bin
393e7ceec507c42733bdf73735ebabfd5a4fb84db2d5e27f48539736d7d26da0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17F10 5300 bytes
font_01_sfnt_off000190f6.bin
1df1f33d318a811af2276cc89c37d53ac242e78c4a86d8a0528e3d1db2e6e912		 pdf-font-stream PDF embedded font (sfnt) at offset 0x190F6 13068 bytes

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