Malicious PDF — malware analysis report

Static analysis result for SHA-256 547595b667da58cd…

MALICIOUS

PDF

73.5 KB Created: 2021-04-15 02:25:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: df9e2dbba5fcb8227493e01824bc5680 SHA-1: 58791c6f0551b3e9f30907dbf837f92d6f070c63 SHA-256: 547595b667da58cd69851a869361fe085a63e979486218b25a7a70bcc66a3528
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fokemale.ru/strik?utm_term=mbe+con+law+outline PDF link annotation
    • http://keniworu.mywebcommunity.org/carteira_de_vacinao_cachorro.pdfIn PDF document text
    • http://xuxijosut.sportsontheweb.net/bokojefezoboza.pdfIn PDF document text
    • http://birapemotafew.mygamesonline.org/tururuxa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379477/normal_5ffb35805df1d.pdfIn PDF document text
    • http://nejevefivi.mypressonline.com/mubipujuseludenigulafami.pdfIn PDF document text
    • http://gajaxujifusokul.mygamesonline.org/cim_mastering_metrics.pdfIn PDF document text
    • http://fuwijumazawad.mywebcommunity.org/gawarafuzasimeniju.pdfIn PDF document text
    • http://sewawena.scienceontheweb.net/craftsman_5600_watt_generator_specs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487658/normal_600cb65100674.pdfIn PDF document text
    • http://fibutogu.mywebcommunity.org/principios_da_administrao_financeira_gitman.pdfIn PDF document text
    • http://gufurebu.medianewsonline.com/xerakimagadilumuzefe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wukevivetarapu.myartsonline.com/antidiabetic_medicinal_plants.pdfIn PDF document text
    • http://kuwemujureza.epizy.com/causes_of_inflation_in_kenya.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/xufebi.pdfIn PDF document text
    • http://mirokuf.rf.gd/bihar_police_constable_bharti_2019_online_form.pdfIn PDF document text
    • http://zikoliduxa.atwebpages.com/fesan.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/how_much_does_it_cost_to_become_a_registered_medical_assistant.pdfIn PDF document text
    • http://wiwosotu.myartsonline.com/ejercicios_resueltos_numeros_romanos_1_eso.pdfIn PDF document text
    • http://bototiluwoge.atwebpages.com/tutorial_calibre_convertir_a_epub.pdfIn PDF document text
    • http://newemepakirid.myartsonline.com/vofabu.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/ravoxukotixaleworat.pdfIn PDF document text
    • http://polabufu.myartsonline.com/writing_and_graphing_inequalities_worksheet_6th_grade.pdfIn 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_off0000e08f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08F 4756 bytes
SHA-256: a3918516e1239b75ac3e01050ed6f17d90b8d84b474aa7200f14ad5772774153
font_01_sfnt_off0000f0f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F1 12028 bytes
SHA-256: bb2ff82a0dc55a41409dd3c50cbde63a0f85bcf5b1f791429cd064ca26dd68b4