Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e598c5a2b7359ea…

MALICIOUS

PDF

86.3 KB Created: 2021-03-27 17:54:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: f4a31a97294b0dd190639bf669ed2ab1 SHA-1: 8c9e97e8dba1a242953b3626de45055f073ec122 SHA-256: 1e598c5a2b7359ea3b775219fb70ee414485ee66eb22d612d9b0a52f83022505
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm designed to distribute or host malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and numerous external URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://nipisod.ru/award?keyword=ipl+2020+list+pdf+file+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4502464/normal_5ff36e446a081.pdfIn PDF document text
    • http://my-favshoph.online/english_worksheets_for_grade_2_articleskc7xg.pdfIn PDF document text
    • http://btsworld.org/samsung_galaxy_s20_ultra_live_wallpaper_apklddef.pdfIn PDF document text
    • http://verifybadgesbusiness.com/child_by_tiger_analysisscucd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370071/normal_6056f30ad67cf.pdfIn PDF document text
    • http://lnstagramcopyrightmanagement.com/dimegod959kd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382961/normal_600f56baf3dd2.pdfIn PDF document text
    • http://demijuv.iblogger.org/how_much_does_it_cost_to_update_snap_on_solus.pdfIn PDF document text
    • http://rodina38.ru/top_20_songs_in_nigeria_2020l5y3k.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f55c6975-0091-4942-a106-dc80285e5f9d.filesusr.com/ugd/8a4248_9ef2c037ae3743a0b258bc485c101bc4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b1611b3-6e85-46de-8aa1-f043aea8e74d/28543178252.pdfIn PDF document text
    • https://8ac5c8e1-9174-427d-95c2-90bebb9f105a.filesusr.com/ugd/44b221_1342d3c569594f12aed1446ad38ab47a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6181010f-5074-4094-8ed2-005c6623cd62/97_honda_civic_transmission_fluid_type.pdfIn PDF document text
    • https://ddb1515c-011f-4d6c-9a6c-b305a2039a85.filesusr.com/ugd/477ac5_db9ad1be549946409265d5b4dfb16098.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ffa4e86-0edf-4cb9-a5b7-e62037679a78/cuantos_metros_tiene_un_lote.pdfIn PDF document text
    • http://wugejevesi.rf.gd/virtual_assistant_training.pdfIn PDF document text
    • http://xarezebabanadot.epizy.com/41892181536.pdfIn PDF document text
    • https://f039f7e9-c7fa-441d-bf3d-2f0e35d6be10.filesusr.com/ugd/80685d_1011c89ca2d4461ca776225a1b145eef.pdf?index=trueIn PDF document text
    • https://d3919fa5-c020-464c-a773-72e456e10464.filesusr.com/ugd/29136f_a48865308de44b94bc4740e77f3670df.pdf?index=trueIn PDF document text
    • http://mujawonevafo.rf.gd/78327885736.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/129c24f4-b185-478b-9bfe-da92156f00c9/dnd_5e_backgrounds_gladiator.pdfIn PDF document text
    • http://jojudodadanu.epizy.com/registration_form_css_template.pdfIn PDF document text
    • https://e5058785-d3d1-442e-b0ad-d0045053dde7.filesusr.com/ugd/17c622_faafbbd3b35c4142a2b5c7b482a36377.pdf?index=trueIn PDF document text
    • https://8a05da06-75fd-4b4b-8779-f7668a2fa4a0.filesusr.com/ugd/da32d9_710bb022ad3c43b6aaaf97696d00a158.pdf?index=trueIn PDF document text
    • https://538d8494-0c7d-401a-b890-0485f6bc7bca.filesusr.com/ugd/29c71c_4bb59e1f96fd4118933b650d7650265b.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0A 5240 bytes
SHA-256: 67885b4acde3efa4e21a3bf905d9bc97baf174647d4127452d75e293504b5dee
font_01_sfnt_off00010003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10003 3396 bytes
SHA-256: 3bea2630dd3871adfedbc39d9c176736674a08b1e733b56eb54238f3154c7233
font_02_sfnt_off00010dd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD9 11048 bytes
SHA-256: 2821dd2bf6316af3500b257be6b66af16dcd3e84fb39dd8577e634ae94a303ac
font_03_sfnt_off000133a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A5 16172 bytes
SHA-256: b6a6ca5d1ececf9b8f85cf34f243a5152d852bd6c46ff1fd844468d100e5349c

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