Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7ab7f44828cceb0…

MALICIOUS

PDF

78.4 KB Created: 2021-03-12 11:17:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1be62ff0ef13a5acf98f80b7728ebf17 SHA-1: c4c34c1748f0cb4571d2abf1c1c2d8e5858cc383 SHA-256: d7ab7f44828cceb01ac0733f8c4d0bd97eb0e16e7b87f6ed539ba4bc8c25b4d7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious content. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to potentially malicious sites. The presence of 'utm_term' parameters in some URLs indicates a phishing or tracking attempt.

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://baarspo.ru/123?utm_term=cribriform+plate+types+ct PDF link annotation
    • http://bu-markett.com/breeding_show_guppiesv0hur.pdfIn PDF document text
    • http://igonlinesupport.com/asmaul_husna_1_lembarp6gdu.pdfIn PDF document text
    • http://gta-msk.ru/26966243156lfedz.pdfIn PDF document text
    • http://yewes.space/244467221010rnrh.pdfIn PDF document text
    • http://koreanluxe.com/afrikaans_language_notes5if57.pdfIn PDF document text
    • http://lololoj.sportsontheweb.net/rukow.pdfIn PDF document text
    • http://ashotik.space/geography_map_grid_worksheetsd9216.pdfIn PDF document text
    • http://ig-mediateam.net/92126497984liss.pdfIn PDF document text
    • http://fakixigulidol.mywebcommunity.org/98389890006.pdfIn PDF document text
    • http://geniusenglish.space/chicken_invaders_4_game32651.pdfIn PDF document text
    • http://cz-nitrof.website/nonlinear_dynamics_and_chaos_strogatz_2nd_editionj7et4.pdfIn PDF document text
    • http://creditscorerepair.info/dirt_bike_tire_size_guidebu8d8.pdfIn PDF document text
    • http://changepass.online/charles_law_problems_and_answersigotq.pdfIn PDF document text
    • http://smartradiobf.ru/dyson_big_ball_animal_vacuum_cleanerhc92e.pdfIn PDF document text
    • http://getfreecreditreport.info/hobart_4612_meat_grinder_manualcy37d.pdfIn PDF document text
    • http://mumolazesinidix.getenjoyment.net/what_kind_of_oil_does_a_briggs_and_stratton_pressure_washer_use.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/3c81961b-5ab8-431f-911c-e6e450d0c621/72636991169.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/392e8082-026f-4999-8e9e-7b3c6bd22ea0/machinerys_handbook_online.pdfIn PDF document text
    • http://tebuwawezizafes.onlinewebshop.net/dyson_v6_motorhead_replacement_battery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e74728c4-63dd-44d1-9583-e702871939b6/12_week_strength_and_conditioning_program_mma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8ae8f9e-2116-4e9e-b0c0-51db6a569986/58472107680.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_off0000f405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF405 5308 bytes
SHA-256: 7fc3edd63f4c9f037e95ecec6a17bd5abc7c6b6f3727916c079d0c5d6ea03f23
font_01_sfnt_off000105ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FF 11420 bytes
SHA-256: 4c8e020f3cdbb97c0d5b7ccefa4d9d42c598d87e514667342f962f75c623014b

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