Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c528b38d1961a05…

MALICIOUS

PDF

76.7 KB Created: 2021-04-09 10:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: efea16ba47301718dd81ec6254be75e0 SHA-1: acabea1886f2acc349730d8b9283a050f7fee4f0 SHA-256: 1c528b38d1961a05c5d8a3f8c6bf4e479a34dab465c5a7adc18d4528281ce230
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 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-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/strik?utm_term=how+to+raise+money+for+a+nonprofit+organization+or+charity PDF link annotation
    • http://save50it.info/foporukavupamusat07wi.pdfIn PDF document text
    • http://bestrongbyg.com/what_does_it_mean_when_you_keep_seeing_repeating_numbersyzavc.pdfIn PDF document text
    • https://sasanufodokedu.weebly.com/uploads/1/3/0/9/130969760/5273387.pdfIn PDF document text
    • http://lnstagramlivesupportcenter.com/esl_present_perfect_and_present_perfect_continuous_exercisesbc5we.pdfIn PDF document text
    • http://vuzisebepuda.iblogger.org/56467734220.pdfIn PDF document text
    • http://sinoxesoxeraxer.iblogger.org/sunuvajowod.pdfIn PDF document text
    • https://mopobaseburole.weebly.com/uploads/1/3/4/8/134859053/919860.pdfIn PDF document text
    • http://bristol-yalta.run/convert_json_to_multipart_form-_datap620a.pdfIn PDF document text
    • http://italysummer.space/44589371664xthpm.pdfIn PDF document text
    • http://amandeepsadyora.com/americas_test_kitchen_roasted_brussel_sprouts_recipehn0a4.pdfIn PDF document text
    • http://fc-aromat.ru/dios_me_ama_acordes_thalles_roberto306g7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://junopufobapepax.rf.gd/zebebumibitexifitavodira.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c852e7a-6d4f-41ba-a2af-db1c00e5feb6/takoxuni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59d892aa-6b1d-41e6-a75a-0bc0de815f66/dumobekiza.pdfIn PDF document text
    • http://fetavuxoze.epizy.com/structure_of_a_paragraph_worksheet.pdfIn PDF document text
    • http://kowelakava.rf.gd/id_card_vertical_template_psd.pdfIn PDF document text
    • http://biledimetiwen.epizy.com/aiims_delhi_nursing_exam_answer_key.pdfIn PDF document text
    • http://sadirifug.rf.gd/print_booklet_upside_down.pdfIn PDF document text
    • http://fakuketuded.rf.gd/what_is_evening_primrose_oil_good_for.pdfIn PDF document text
    • http://pofulexurukuka.rf.gd/72619986447.pdfIn PDF document text
    • http://wurasegato.rf.gd/nabucco_libretto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70b8ec9b-2045-4941-93cf-eb90c5afc56b/refifibuwegopoxevuxa.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_off0000eb79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB79 5604 bytes
SHA-256: 20a9c76ea506c367236557588102eee3b19ababdc32e8ca832d72bc162061045
font_01_sfnt_off0000fe84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE84 10720 bytes
SHA-256: f789709014a1c8e1c779c105f860c47f2c30d1d044e784136f3fafa634eea363

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