Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1f8f4ef179eab13…

MALICIOUS

PDF

76.3 KB Created: 2021-03-17 03:19:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 48639278089f3a4823286e97dae6a8ab SHA-1: 71d010919475687cdf36b33568c14769ec94c7fd SHA-256: b1f8f4ef179eab13add6254e83043ed99bf656587d2c245f8ab55699287c3597
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 0.9986

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://dugedepap.ru/award?keyword=attitudinal+barriers+in+inclusive+education+pdf PDF link annotation
    • http://nazorizuz.medianewsonline.com/neverending_story_limahl_song_download.pdfIn PDF document text
    • http://gamowenugeg.sportsontheweb.net/where_are_keurigs_on_sale.pdfIn PDF document text
    • http://worameruvejaka.mywebcommunity.org/lepatadedavozodubuv.pdfIn PDF document text
    • http://xofofumireke.mypressonline.com/celtic_mythology_tales_of_gods_goddesses_and_heroes.pdfIn PDF document text
    • http://mavigawika.scienceontheweb.net/24389777370.pdfIn PDF document text
    • http://patajafurep.mywebcommunity.org/what_does_garmin_lmt_d_mean.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/5f629f96-35e0-485c-b5b5-7bf5bbe23a1e/finudokoxodujiribetatu.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/buffer_overflow_vulnerability_lab_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6dadcb3-fdbf-4a6f-98d5-f3bc731e38a2/2005_nissan_murano_for_sale_by_owner.pdfIn PDF document text
    • http://vutogebufuz.myartsonline.com/arminia_bielefeld_spielplan.pdfIn PDF document text
    • https://s3.amazonaws.com/zewimu/sig_p229_holster_owb_leather.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b8d8fac-7b0d-4c0c-942c-d09025a912ed/linksys_ea4500_max_download_speed.pdfIn PDF document text
    • https://s3.amazonaws.com/vexeliku/cesar_chavez_movie_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/vobuwekoxataregekelefux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a6566de-2796-454d-8292-a0801c8eac56/what_is_the_difference_between_waterfall_approach_and_agile_project_management.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/zigofudub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1f95f3c-7abc-4f4f-a7c0-a1135e991b12/is_iron_good_for_working_out.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dc57e27-abf3-4987-bc52-b5ed4a4802e6/young_couples_bible_study_curriculum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3ef4ef3-b2bf-41d2-bd6a-f1d5611bfd85/12667734860.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxagixil/mezalawesejaruxevufinobi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca2c7a07-f2ae-48af-b366-2a5982f48bd4/25343245013.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_off0000ed29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED29 5340 bytes
SHA-256: 067f4f76d4e3628be0366dd3868c561d23405f95980f9de1406e1c1d8f064389
font_01_sfnt_off0000ff61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF61 10496 bytes
SHA-256: 81840b76b7b372f397adc3c0c1dfbc1c12dd3a26f2598e08bc0a648d5efca5d3

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