Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb3a2cfc4b2fdc96…

MALICIOUS

PDF

79.7 KB Created: 2021-03-09 00:09:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 6ace02a7d50b31c0661a7ef96732af9c SHA-1: 5178c76e1fe1f01003cda05de62d973ae809a6cf SHA-256: bb3a2cfc4b2fdc9640d15395a6ac4ed9d2b1b41f5488d25506f59a7c15865b9e
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://gimoguvi.ru/123?utm_term=microcephaly-+capillary+malformation+syndrome+symptoms PDF link annotation
    • http://meine-gebuhrenfrei.com/33542901970e5oj7.pdfIn PDF document text
    • http://muldwych.com/xilomikolevelukolikuzurovxgcz.pdfIn PDF document text
    • http://smm-target.ru/waircut_1.8_tlchargement_libre5knja.pdfIn PDF document text
    • http://mastericy-chistoty.ru/7209960831698317.pdfIn PDF document text
    • http://reduslim-italiaoficial.site/rokekegixivezonuctqaq.pdfIn PDF document text
    • http://rkconstructionsucks.com/funciones_trigonomtricas_ejercicios_resueltostprux.pdfIn PDF document text
    • http://nizagose.66ghz.com/ketoz.pdfIn PDF document text
    • http://trening-ekaterinodar.ru/wedowonos72fm.pdfIn PDF document text
    • http://tadigewatogonun.22web.org/32948991832.pdfIn PDF document text
    • http://meetraisins.club/el_arte_de_la_guerra_libros_similaresk5ll3.pdfIn PDF document text
    • http://hookup157.online/how_do_i_prepare_for_a_sales_manager_interview3is4e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wosotufozutula.epizy.com/configurar_router_d-link_dir-615_como_access_point.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14edd932-8320-4585-a335-7bc40333c5d8/ernest_hemingway_a_biography.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66cae5c0-e8fd-4d7b-b838-7a46a6e15ed9/a_streetcar_named_desire_scene_5_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db074055-6f3b-4638-b7a8-ff3fe2ac3a1b/tididixivibezifemoxegajuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5691950f-d951-41e3-8604-912e7759337e/evinrude_25_hp_2_stroke_manual.pdfIn PDF document text
    • http://sirovorisolilu.rf.gd/que_es_el_outsourcing.pdfIn PDF document text
    • http://dugafoto.epizy.com/craftsman_20_hp_lawn_tractor_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1543e9b9-654b-48dc-a090-20483c95f1dc/george_herbert_mead_mind_self_and_society_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/435e2af8-5aad-493f-8849-efde9f6aeb3c/master_of_the_universe_edward_and_bella_fanfiction.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7570e7c1-c28f-4010-b567-73fbab8fca8b/walmart_black_friday_2020_tv_deals.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_off0000fa5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5C 5536 bytes
SHA-256: 43878354b62c952575c329e3b0fbe7a8395be0f41d40b9e94ccf0248a58a9d40
font_01_sfnt_off00010d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D21 10668 bytes
SHA-256: 03d7af2ccdb7319a513b98fbcbbbb318893a82546208781d49f7ef032e5595a9

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