Malicious PDF — malware analysis report

Static analysis result for SHA-256 00ac385126759cc9…

MALICIOUS

PDF

76.8 KB Created: 2021-05-09 15:15:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 93c19276c93ded19307f6628b0ea7cef SHA-1: 56b107e9c1e4b95af9b45a4672eaf0e4b2600dc0 SHA-256: 00ac385126759cc92e8e2e775bb5cf8973b65ba20e0286ffc2e83a6b78f564c7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by 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

  • 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://seumenha.ru/strik?utm_term=experience+human+development+13th+edition+online+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501212/normal_5fd14b2155183.pdfIn PDF document text
    • http://kawojoxakinit.22web.org/the_rational_optimist_by_matt_ridley.pdfIn PDF document text
    • http://pevurupijovuzut.22web.org/59200457259.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389384/normal_60096bd884e84.pdfIn PDF document text
    • http://wuzotevoxed.22web.org/agriculture_optional_notes_for_upsc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485570/normal_5fd12211c9331.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/e5f4a7c5-a942-47c9-bdb1-99fdc7e1a707/what_is_the_box_model_mcq.pdfIn PDF document text
    • http://gusadixesexa.epizy.com/jrcalc_clinical_practice_supplementary_guidelines_2017.pdfIn PDF document text
    • http://deravamosu.rf.gd/kadawiwijuweruledopolu.pdfIn PDF document text
    • http://gujodelabugujaf.rf.gd/blood_relation_questions_for_ssc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dac5bb84-4127-4709-a966-e023172c7195/572602202.pdfIn PDF document text
    • http://wabelat.epizy.com/39040341151.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee6ab665-da00-4c5d-8f62-b2050789c225/what_is_the_role_of_correction_in_criminal_justice_system.pdfIn PDF document text
    • http://pizoxuwa.epizy.com/beethoven_concerto_violin_sheet_music.pdfIn PDF document text
    • https://901c4554-6fda-40bf-8344-1f1538f5dc06.filesusr.com/ugd/a76634_475872336c234cadbf3104c713f4d695.pdf?index=trueIn PDF document text
    • https://299bc67c-4c9a-44ea-852c-18f2d39dca40.filesusr.com/ugd/954c8b_f5e7ed83f13a476eb938c7dd8edcfa80.pdf?index=trueIn PDF document text
    • http://buluzapatevade.epizy.com/glacier_bay_faucet_drain_leaking.pdfIn PDF document text
    • http://kanisal.epizy.com/beniwizufuduw.pdfIn PDF document text
    • http://gixisenusadat.rf.gd/autoimagen_psicologia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c56000e8-68ab-4b71-a5e3-ed4965469485/91480669214.pdfIn PDF document text
    • http://ninonasoligu.rf.gd/aha_guidelines_for_sbe_prophylaxis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12bce86f-0152-4d57-ab3b-732b85754aed/pedagogy_of_the_oppressed_free_download.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_off0000e9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B6 5516 bytes
SHA-256: 6e4f8c969902da259993a068b27f5b1da037926e0e51eb7e442aafd56116ab9c
font_01_sfnt_off0000fc66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC66 11664 bytes
SHA-256: 33ab4b5457cc5524113fe09c0bb18f6a267db0a25cded64bc739b8bdcd0df7c7

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