Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea66d1a1ac6f4c0d…

MALICIOUS

PDF

96.1 KB Created: 2021-06-13 04:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 590700329c1f0e718011cdf6a2d4d550 SHA-1: 6dac32a0d07992c9972edc89b50d82ee18967dd5 SHA-256: ea66d1a1ac6f4c0d73c6e88b53aed8934b6154566c3b6246881994e1d4249002
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, and one specific URL (`https://cructi.ru/pbw?utm_term=moonlight+sonata+ukulele+tab+pdf`) appears to be a redirector for malicious purposes. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a link farm designed to funnel users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://cructi.ru/pbw?utm_term=moonlight+sonata+ukulele+tab+pdf PDF link annotation
    • https://nuniladolu.weebly.com/uploads/1/3/0/7/130775245/212366.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501054/normal_5fc6afaf4bb24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390328/normal_5fd0b8ea590d4.pdfIn PDF document text
    • https://labifunuvi.weebly.com/uploads/1/3/4/8/134847398/563cf4c5f4df.pdfIn PDF document text
    • https://wubinuju.weebly.com/uploads/1/3/4/6/134642725/tajizetofupa-fewomamopudomes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/4f1557ab-c046-4c14-971b-46ba802069ba/instantaneous_velocity_formula_without_calculus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/449467dd-f5c7-40dd-b8f4-3aa71af4b488/94734675682.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fef5e9f-4259-4bb8-af07-f18fe14bb821/the_oxford_english_grammar_sidney_greenbaum.pdfIn PDF document text
    • http://fibonilavi.pbworks.com/w/file/fetch/144785070/how_to_use_the_ordinary_products_for_oily_skin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84e275dc-d6bc-4c15-88b9-921940d0ac0e/kobemabukosibimoxiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19c243c5-af4f-4834-850f-0c63136d1444/6.0_powerstroke_transmission_filter_delete.pdfIn PDF document text
    • http://noxixap.pbworks.com/w/file/fetch/145187199/casio_fx_100ms_calculator_tricks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78c4be4d-e80a-4bcb-803d-be991e599720/que_preguntas_hacen_en_una_entrevista_de_residencia.pdfIn PDF document text
    • http://dagomiwavi.pbworks.com/f/gisufekukuderowelewom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/773028b5-7d5f-4f44-83de-7395f24de083/lycoming_io-320_maintenance_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eac5863c-7eb0-4f04-831e-23771e4257a3/29769288660.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d52a568-ea13-43bf-8f54-42c469791707/8193686906.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a2b477c-534d-417f-b87a-8e2025786d29/why_is_my_wifi_calling_not_working_samsung.pdfIn PDF document text
    • http://fuxedemama.pbworks.com/f/cuarto_elemento_mas_abundante_en_el_universo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d4b2e0e-e7b1-4af4-ac83-c497e011344d/88165966882.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e39803c-1c17-473e-8d66-cdf3533114b8/atlas_copco_ga18_compressor_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012ca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA7 5296 bytes
SHA-256: 558e492b5d144637451d5207e17a795d66a2b5f4b1b957ba54924939a2e13107
font_01_sfnt_off00013ea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EA9 11424 bytes
SHA-256: 8cd8a4584960dc97e57c6a376c6c35b378745b02cf0255459e530d6410b2d14d
font_02_sfnt_off00016582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16582 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361