Malicious PDF — malware analysis report

Static analysis result for SHA-256 0858048e9593db8e…

MALICIOUS

PDF

73.5 KB Created: 2021-06-01 07:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2b42b05ff317d19286b366fca0ecc027 SHA-1: da7a3ba8564ec068f29aa2ed9d96c7e5ff282734 SHA-256: 0858048e9593db8e6f8aa8a5aac8c025be7fab4eada2d950c55aeec7e6275b90
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous external URIs, with one specifically pointing to 'philabc.ru' and a query parameter suggesting a lure for 'choral sheet music'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates a malicious intent to host links on disposable domains. No scripts were extracted, but the overall structure and URL suggest a phishing or malware distribution attempt.

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://philabc.ru/pbw?utm_term=here+i+am+lord+choral+sheet+music PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382209/normal_6046f3076fde9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490001/normal_5fcb67e31f45c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422894/normal_60323a2d6fe27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481155/normal_5fdc3f82e0656.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4489240/normal_60b0d4c0a1547.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4482863/normal_60b4db5a35836.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413570/normal_605a57d026e20.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e860c9c-c944-462a-b991-3dbf0f6adde4/motorola_moto_360_2nd_gen._mens_42mm_smartwatch_black_with_black_leather.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/471aef0c-7ba4-4730-9cbb-fa84746f9672/drinkwell_pet_fountain_cleaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b8793d9-6ba1-4097-a7b7-f8d079600342/rodrigo_amarante_tuyo_mp3.pdfIn PDF document text
    • http://mukonisu.pbworks.com/w/file/fetch/144446259/what_is_the_main_function_of_amniotic_fluid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d268cba4-ec27-4717-888c-bb1bd4060a33/setinilazupixujixov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07e0da3c-0921-42b8-8811-5c40b9efa181/first_grade_reading_workbook.pdfIn PDF document text
    • http://giresizuloki.pbworks.com/f/what_happens_in_michael_vey_7.pdfIn PDF document text
    • http://zikupuzajix.pbworks.com/f/mason_dixon_volleyball_tournament_2020.pdfIn PDF document text
    • http://ziduzobif.pbworks.com/w/file/fetch/144447390/how_to_get_error_codes_on_kenmore_dishwasher.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42934bb8-8f29-4753-b28b-a52d7b93c751/mojewagudujunulan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fea55649-ac1f-4811-8f9f-648dae259b14/htc_one_m8_case.pdfIn PDF document text
    • http://vadibun.pbworks.com/f/rivelexuvuretovoso.pdfIn PDF document text
    • http://gatasulupu.pbworks.com/f/3971532089.pdfIn PDF document text
    • http://vatojorisa.pbworks.com/w/file/fetch/144442542/nuvexamimetugugejupa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19afbac2-083e-4795-b753-d0f665b64add/53474588091.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/w/file/fetch/144411951/construction_site_visit_report_format_examples.pdfIn PDF document text
    • http://mikabipi.pbworks.com/f/tabla_de_equivalencias_de_unidades_del_sistema_internacional.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_off0000e431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE431 5140 bytes
SHA-256: 34fc420b1501e70ba0c5a3b52fe7d776b4403c4db39d22f8204ea35af17c61d0
font_01_sfnt_off0000f578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF578 10092 bytes
SHA-256: 89a416dda86a6a7b6ed1e1e86e3698cd1532ef7edd119b92e75a56fa683af71f