Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bc9fd78307ee7c7…

MALICIOUS

PDF

79.0 KB Created: 2021-04-05 09:18:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 95efc5931351bb6b3139b16979ddee06 SHA-1: 90f23cc9f5c54d068e02d3b121e40d72a44b3622 SHA-256: 3bc9fd78307ee7c7e174579bc20ef00e4161f057d44dc95c2727cac4c87131f5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including a machine learning model and ClamAV, as malicious and likely phishing-related. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/award?keyword=abet+criteria+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446937/normal_602fccb1d6abb.pdfIn PDF document text
    • http://wezotodatixazu.iblogger.org/nekuxo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382620/normal_601fe902025b2.pdfIn PDF document text
    • http://woziwowariv.sportsontheweb.net/tu_assumeras_tes_desirs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411490/normal_60167822b4b53.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414334/normal_5fcd304fd8f14.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kogotiru.myartsonline.com/narek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b76552cf-2ebc-492e-96b9-2f6acffe7d6d/is_black_positive_or_negative_on_jumper_cables.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/015c4d36-c054-4541-b42f-8d2ae0de748e/fojipa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be91cdf9-2ec6-45fb-a564-65a79e02bc7b/kadenalezumoro.pdfIn PDF document text
    • http://tuxiwifu.rf.gd/artificial_insemination_in_farm_animals.pdfIn PDF document text
    • http://pakemeza.epizy.com/katy_perry_roar_mp4_song_free.pdfIn PDF document text
    • http://bokatamekal.rf.gd/microsoft_dynamics_365_licensing_guide_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08e64d54-89e4-4086-82ee-63f80e470e66/how_to_change_sandpaper_on_black_and_decker_mouse_sander.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0366a9b-de49-4c71-94e7-3515d13b2c03/how_do_you_describe_a_waxing_moon.pdfIn PDF document text
    • http://jisipisadelotab.epizy.com/85084542473.pdfIn PDF document text
    • http://tamedigozetot.epizy.com/gigebotiberiwas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f176018-3660-4f59-8956-df870035f034/mobile_pawn_shop_business_plan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57680387-aee6-43b4-9bc8-a759a5b20a3b/how_to_hard_reset_a_rca_voyager_tablet.pdfIn PDF document text
    • http://segugixitibuka.epizy.com/properties_of_matter_review_worksheet_answer_key.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_off0000f7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B3 5068 bytes
SHA-256: 90ecb252e54288238827b13f1646e2689e3e1da66566d7a189428ba6c3643d55
font_01_sfnt_off00010901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10901 11388 bytes
SHA-256: 56031c2583fedac88c245b88958477f1da4b5069f163b19568e20966876ca2aa

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