Malicious PDF — malware analysis report

Static analysis result for SHA-256 f84850e5a6d322e4…

MALICIOUS

PDF

103.9 KB Created: 2021-03-10 05:45:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 75d9a8550a103305344adff1a62bbb82 SHA-1: 42def6a5eda1b53c8d08c9ab157c9401c76bc3cf SHA-256: f84850e5a6d322e4c15dd5829ad7f7ddb257ff1a16d5b1673b60689131b8831d
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 6

  • 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 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://kuzutuzo.ru/wix?keyword=banagher+links+reddit PDF link annotation
    • https://cdn.sqhk.co/firavibaw/ggAidhc/lewafuvobifupuvitetuwa.pdfIn PDF document text
    • http://mosquito.codes/496160180419ou3v.pdfIn PDF document text
    • http://werenntaq.online/gta_v_pc_controlsl32a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471273/normal_601d9cf275e81.pdfIn PDF document text
    • https://cdn.sqhk.co/jegamaxegev/mhihgjf/monumekamigidapo.pdfIn PDF document text
    • https://cdn.sqhk.co/tubafejog/gGjaPji/rirulenesoduwefulisimir.pdfIn PDF document text
    • http://lnstagramverifiedbadge-media.com/66257482894epaiy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451231/normal_5fd611d7bc948.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530868/normal_60464a8817dac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453889/normal_5fc5b239628f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369930/normal_601ba87d66f09.pdfIn PDF document text
    • http://copyrightram.net/marvel_schebler_aircraft_carburetor_service_manual4s5ko.pdfIn PDF document text
    • https://cdn.sqhk.co/remokuvupen/2geigjb/the_four_seasons_vivaldi_sheet_music.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://45ae50e1-98a8-4501-9ad6-fc0df438eb43.filesusr.com/ugd/b16523_19393842c9004d58ba0bddb6907d9375.pdf?index=trueIn PDF document text
    • https://d7ae471b-a447-437d-81b4-4e603f8679d9.filesusr.com/ugd/0a3240_ec820d48fa854e1185dbee9beda27dbb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/powerpoint_datasheet_l_g.pdfIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/68526808896.pdfIn PDF document text
    • https://9a60fab3-6fb0-4be7-9305-b2e3cc44d963.filesusr.com/ugd/811c4f_bf036684c87344fb85d8a2ed6269c995.pdf?index=trueIn PDF document text
    • https://f733e552-90a1-4d1f-83ca-a6b36afcf31c.filesusr.com/ugd/38bf1f_e31b8b8052204a2cbfb43628946ecfdf.pdf?index=trueIn PDF document text
    • https://7e073981-ad1c-4081-8dc0-76946ba36063.filesusr.com/ugd/c4f63d_14350fe563d34d3f91337d898b2ffd6d.pdf?index=trueIn PDF document text
    • https://d6aab468-caab-4d9e-910f-d3bf64ae4104.filesusr.com/ugd/5438e3_24501e6b97e44acf927a1507352ad690.pdf?index=trueIn PDF document text
    • https://af1bea64-f5cd-41c2-a7c1-97f21c1aa057.filesusr.com/ugd/592671_fe5b40dcd6de46168152c5f170460685.pdf?index=trueIn PDF document text
    • https://ee42ee57-4547-4a8c-8a66-6cccb7f6869d.filesusr.com/ugd/2a9ad2_3d7b3a76595448938ee49c3fd480da1b.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000142a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142A8 3288 bytes
SHA-256: 9b42b1954523911ad62622f2f11ff86ae225e32274ad39b0e82d73c4af68ea15
font_01_sfnt_off00014e6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E6B 4876 bytes
SHA-256: 21990eda6a239c72aea34a780e5bfa33e6ee4f73457282bf711440638448d2b0
font_02_sfnt_off00015ee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EE4 11036 bytes
SHA-256: 2e3f25ef229363b777aaeb2e22d552a9538d8580059cd9a49a74405eebe90042
font_03_sfnt_off000183c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183C0 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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