Malicious PDF — malware analysis report

Static analysis result for SHA-256 f61b4d2bc4368c0c…

MALICIOUS

PDF

76.3 KB Created: 2021-03-22 16:56:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c3e543c1a6a854dd5e87ceff4b5f2ef7 SHA-1: 960c7dc4dd98ff46ae4e4d354ccc4b5b89446c68 SHA-256: f61b4d2bc4368c0c35d0875594fc4eb7ea72d8c7a63f4a53a4e63e407e2265a3
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://jottigo.ru/strik?utm_term=the+bell+jar+summary+chapter+1 PDF link annotation
    • http://nigemutekilum.mypressonline.com/12112284583.pdfIn PDF document text
    • http://pobopel.iblogger.org/duracell_nimh_battery_charger_flashing_red_light.pdfIn PDF document text
    • http://rotixumuzu.22web.org/45124087996.pdfIn PDF document text
    • http://vovavipegum.getenjoyment.net/nijebexovafa.pdfIn PDF document text
    • http://xulubapatoso.scienceontheweb.net/32823791705.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/acc405a4-881b-4b79-83d3-868165c01cc5/learn_conversational_hindi_app.pdfIn PDF document text
    • http://xonolori.atwebpages.com/bengali_short_film_script.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bee450f-279f-4a50-8b4c-e910df8d5500/15786634460.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c475192-d9d8-4cd1-b7ea-8c71e328ef8b/kivodexuvabi.pdfIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/descargar_concordancia_biblica_para_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05a2045d-ffb2-4bc1-a3d6-d1caf61b4236/cirque_du_freak_manga_volume_11_read_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cda59374-9dcc-4de6-9ab2-8b37cae80303/vazada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ff3f513-4684-49ba-95a6-73fecb95414f/ver_pelicula_un_puente_hacia_terabithia_espaol_latino_online.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/47437025500.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f958b32-350f-429c-baaf-7cc0b2b96173/baxabo.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/literature_circle_worksheets_high_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a42086f-fb5f-401b-9705-20fb38e8ab90/80709201132.pdfIn PDF document text
    • https://s3.amazonaws.com/kefodek/atrial_fibrillation_treatment_guidelines_2014.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30dbad07-c414-414f-8b47-4d6fd355b11d/smedley_butler_war_is_a_racket.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68e7e362-5b83-4126-b5c7-e0bc0921f83a/introduction_to_accounting_and_business_chapter_2.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/91884691535.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_off0000ee35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE35 5492 bytes
SHA-256: ae1587d365e42b8b6e7d15b5d78732ec4d5482dcd1f7281aa6be961415c638df
font_01_sfnt_off000100c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C0 10100 bytes
SHA-256: c6b72d23cb2f5f0cf5575442d9d149a6fd04c7b75525d1f051b119ac5758e4c1

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