Malicious PDF — malware analysis report

Static analysis result for SHA-256 5676b8f42dc6c4cf…

MALICIOUS

PDF

72.1 KB Created: 2021-03-23 01:46:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 281724e68faa969e5b31a161deaff42d SHA-1: 5f4058fc07249786323d5ddb51f74531b063c527 SHA-256: 5676b8f42dc6c4cf64b0ee12336c64d8303bbb189f28345bbb31fef36e8729a4
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farm characteristics further supports this. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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://mezovuduw.ru/wix?keyword=earth+taken+1+unblocked PDF link annotation
    • http://tuvurebomiworo.scienceontheweb.net/alguien_esta_mintiendo_libro_gratis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388629/normal_60220f6e74ca6.pdfIn PDF document text
    • http://kindraretterath.com/how_to_relax_tennis_elbowl4izc.pdfIn PDF document text
    • http://serviceforyou.site/wodepuxikaxeg5hsjq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480588/normal_5fdfb2a6d1e24.pdfIn PDF document text
    • http://makikupake.iblogger.org/flowers_for_algernon_full_play_script.pdfIn PDF document text
    • http://rimiripa.mypressonline.com/sap_basis_system_administration.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427287/normal_601acae17c3e6.pdfIn PDF document text
    • http://fulukegoror.getenjoyment.net/nezedaxu.pdfIn PDF document text
    • http://ultra0.space/donababilibutomexezunazid1krx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393346/normal_5fd287e7a4f9c.pdfIn PDF document text
    • http://jeseselanus.scienceontheweb.net/61146484425.pdfIn PDF document text
    • https://xemizumelisiga.weebly.com/uploads/1/3/1/8/131856695/lelagegupu.pdfIn PDF document text
    • http://opensol.xyz/bidiwiwuwasasibexudowudq4729.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426063/normal_604a999f33ff7.pdfIn PDF document text
    • https://lajogaful.weebly.com/uploads/1/3/4/4/134481829/4588833.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c8019651-2137-4367-b38e-775fff3f8a75.filesusr.com/ugd/fc5a02_c4281634d38a409bb78938fd45721caa.pdf?index=trueIn PDF document text
    • https://49432a94-54bc-4d13-9d12-ea41d731e1b8.filesusr.com/ugd/a7c689_3b1a1e894dda4fbeaecf83aa8b847231.pdf?index=trueIn PDF document text
    • https://14319df0-7947-4f0d-bbb3-eaa17d5eb23e.filesusr.com/ugd/c45f38_9993c40fb5d04d7c86611f6d9c01680d.pdf?index=trueIn PDF document text
    • http://wegewid.epizy.com/media_and_cultural_studies_keyworks.pdfIn PDF document text
    • https://69a21580-3c80-4f81-8097-1ec0bc18215d.filesusr.com/ugd/bd7df1_263f1a790d5e46778c6f9a2e97f3f3ef.pdf?index=trueIn PDF document text
    • http://piwolimosopobu.myartsonline.com/convert_file_online_for_free.pdfIn PDF document text
    • http://wuzuruwevirelu.rf.gd/leruf.pdfIn PDF document text
    • https://d1e6aceb-f258-402f-b59e-92ecb386693c.filesusr.com/ugd/2cc58f_ba3dbcc914d146aa9572a6aa57843112.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC31 5060 bytes
SHA-256: 7b41524660027752f1ea309ba3a4b5348f871c1c299dc07132ff23f419eb7952
font_01_sfnt_off0000ed62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED62 10612 bytes
SHA-256: fc429ef592f808210f32c44f193807d7bcbebc8db618653fbdc769424c14e903