Malicious PDF — malware analysis report

Static analysis result for SHA-256 194447a78428f3db…

MALICIOUS

PDF

80.6 KB Created: 2021-05-04 10:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba863c5a4ae905ff01ea096650771607 SHA-1: 2ee2261d812ed6aa2d9c629e725dae2f27c81bb1 SHA-256: 194447a78428f3dba91c3d9df5eccab34c6cd90d954b72b662d4a7c6c8ea76fc
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • 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
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=sears+kenmore+humidifier+filter+14911
    • https://cdn.sqhk.co/timafewa/UD3hger/silicon_valley_tv_show_netflix.pdf
    • http://jevopapivixepe.iblogger.org/xuvelefagevuxokusemalawu.pdf
    • https://cdn.sqhk.co/bizujutenifo/ejgvKTk/prop_hunt_among_us_mod.pdf
    • https://cdn.sqhk.co/remozemot/gggdujb/simsimi_app_store.pdf
    • http://venatavokawudo.iblogger.org/html5_cheat_sheet_with_examples.pdf
    • http://xusetelokumupoz.iblogger.org/what_are_the_objectives_of_hrm_function_in_an_organization.pdf
    • https://cdn.sqhk.co/disonixures/Kii6PRp/givuxitizuminanijufaf.pdf
    • http://kijejakedaje.22web.org/kudinofemapadavoxat.pdf
    • https://cdn.sqhk.co/xitilesuxiw/cD9BUbI/bedwars_map_download_mcpedl.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fuvidokibet/dojixofejuparonat.pdf
    • https://s3.amazonaws.com/waduzirader/kossel_mini_build_guide.pdf
    • https://s3.amazonaws.com/petikamov/vewejuzinuborewisuxebejuf.pdf
    • https://s3.amazonaws.com/sefepugolupalax/zuwefefuta.pdf
    • https://2f60c0de-bae8-48d8-8f3f-ce7907f87c52.filesusr.com/ugd/badafb_f9419f6ae3794c1ebe05c7056e28b4d3.pdf?index=true
    • https://s3.amazonaws.com/sonutopexaramuf/xatituwivotugezegazipu.pdf
    • https://uploads.strikinglycdn.com/files/40177690-2f32-442d-b14a-87a91220b009/5_stages_of_creative_development_eyfs.pdf
    • http://begosene.epizy.com/simplifying_algebraic_expression.pdf
    • https://2e8e3215-33bf-4fe1-bc67-b38dac560527.filesusr.com/ugd/269bb8_1053024ecb7a46669c6b04a5d258a967.pdf?index=true
    • https://s3.amazonaws.com/muvazi/brown_rice_vs_white_rice_nutritional_information.pdf
    • https://uploads.strikinglycdn.com/files/647d4bc5-05fc-4b2a-9701-15b8cbdd3f27/navajo_code_talkers_dictionary.pdf
    • https://uploads.strikinglycdn.com/files/d7c7046f-5b8c-4240-b085-cd85e1902f86/xubefajona.pdf
    • https://0e67983c-e844-40c9-b604-97311ec94efe.filesusr.com/ugd/6e13d9_49469dd966e2454c9dd6ff745ed8c37e.pdf?index=true
    • https://s3.amazonaws.com/gulapore/what_do_you_need_for_a_real_id_mn.pdf
    • https://s3.amazonaws.com/vefagotoje/4591427648.pdf
    • https://c8a164a7-2549-4056-b209-d27d417f800b.filesusr.com/ugd/136d3d_91441abce04942b896649610f9b5be24.pdf?index=true
    • https://3ced707c-20bd-49bb-93f1-edb15be4e391.filesusr.com/ugd/e90305_098ad74a82c34f89b7a2813f4fecde98.pdf?index=true
    • https://s3.amazonaws.com/gumagabu/66378064841.pdf
    • https://uploads.strikinglycdn.com/files/2235f09a-4f69-494b-a208-fd866bd9db03/what_is_position_distance_and_displacement.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_off0000fb8e.bin
0191e69724ff2900b85b3e4559c8e718c9fe9b022f71cd044d818b01e23c10a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8E 5612 bytes
font_01_sfnt_off00010e7f.bin
001b5a585acb4e990ae2877a49aaca6ede4fcdf774fd440c281a2a1b8b9eec9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7F 11360 bytes

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