Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c40212b9f4abb30…

MALICIOUS

PDF

78.5 KB Created: 2021-03-17 12:45:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: cf5e602c0deb8efd80607943075edb16 SHA-1: b0d345d471431343e40492987e8278f6550ef096 SHA-256: 9c40212b9f4abb30c783fab6ce939e0b3a1325fc36fa2db5cc81d5589acb516a
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 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/wix?keyword=stem+club+activities PDF link annotation
    • http://wufusigemaxegok.iblogger.org/avenir_conseil_formation_catia_v5.pdfIn PDF document text
    • http://sosunimepewe.22web.org/bejizetizi.pdfIn PDF document text
    • http://nazorizuz.medianewsonline.com/49805221133.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jeborawaleko.atwebpages.com/17849397037.pdfIn PDF document text
    • http://vegegaba.epizy.com/rujetopijosetujagaxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/945184d3-dc19-42c8-a534-9eea2be2d50b/agnolo_di_tura_sienese_chronicle.pdfIn PDF document text
    • http://pebomotixot.myartsonline.com/how_to_reset_element_tv_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fb76a25-6b06-442c-af11-fca34fe012e1/how_do_i_rent_movies_on_dish_network.pdfIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/nomao_camera_apk_pure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97168603-061e-4186-ae4e-ebdf96677621/faxijinefokafopewaluxi.pdfIn PDF document text
    • https://s3.amazonaws.com/dusined/rulakeromuwojanami.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f3b6eaf-7c38-426b-87c4-5f1910520879/how_to_do_proper_breathing_exercises.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff791ffb-16b9-4b10-82c7-ac4366f78bd1/vineragavinar.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/health_economics_careers_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d47c4bd-87a4-4abb-bc6a-43e6291f2646/platicas_de_seguridad_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bcf7a24-8d3e-4b6c-84f8-20f5980c72d9/i_spy_with_my_little_eye_meaning_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/vojaxewez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f455dbb7-fa2f-4ea6-b35c-8030ffe8bdff/first_aid_qa_for_the_usmle_step_1_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2147544e-5f27-43de-9b62-6b5ec56d34cb/lonely_planet_iceland_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e5c758a-8558-4261-ac3e-d0febe2347e5/low_organised_games.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd4e1af6-0795-4fc5-89f7-261897da9017/dell_inspiron_14_5000_price_philippines.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_off0000f55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55E 5152 bytes
SHA-256: e2360e8383c7230aa5e51407504f6c6f01c9d7985d15f9a41a14148937802c62
font_01_sfnt_off000106d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D8 10816 bytes
SHA-256: e09ce84a15dad4d303dcfeaf9ef0431796df3b93440b50977fb744bd6fe06f2d

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