Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd4750c8af94d453…

MALICIOUS

PDF

77.0 KB Created: 2021-03-11 23:13:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 9e3fd9a998329ee6fc236c4354b18ca9 SHA-1: 7f462e08f2ea0db4397cd6888bf48b3298a24837 SHA-256: fd4750c8af94d4536d4b11f296f212917f9eb49135269ea5a4cd21aa139be3a6
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with a high-confidence heuristic indicating it's a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains keywords related to academic essays, suggesting a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dugedepap.ru/award?keyword=karl+marx+conflict+theory+essays+pdf PDF link annotation
    • http://cookwellbakewell.com/warhammer_2_bretonnia_guideouiki.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvinudubuno/BYShaUG/adventure_time_squirrel_in_my_mind.pdfIn PDF document text
    • https://cdn.sqhk.co/vetukalujir/1rmoAjv/10222585237.pdfIn PDF document text
    • http://golden-bridge.pro/dokusegotaxaguojw0a.pdfIn PDF document text
    • http://nefupanono.mygamesonline.org/ejercicios_de_probabilidad_y_estadistica_resueltos_para_primaria.pdfIn PDF document text
    • http://juzufezike.mygamesonline.org/nemexixamizuboridizelosob.pdfIn PDF document text
    • http://xerujupuje.sportsontheweb.net/wave_equation_analysis.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/fce8cdbb-93f4-47fa-8256-906e8a1f5a79/1975_honda_cb550_wiring_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1bbf6ce-2e9f-4d79-a3af-a657fca3b750/antiderivative_of_csc_cot_x.pdfIn PDF document text
    • https://s3.amazonaws.com/juvetaso/braun_shaver_series_7_manual.pdfIn PDF document text
    • http://megisaduvivegi.epizy.com/kiwovoletuzubido.pdfIn PDF document text
    • http://pajinofemi.epizy.com/bestwap._in_movie_2018_sauth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a18912c-8cea-4a08-bd4f-628590783d9f/he_amount_of_kinetic_energy_an_object_has_depends_on_what_two_things.pdfIn PDF document text
    • https://s3.amazonaws.com/bivanud/devi_purana_in_bengali_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e23238c-e73d-4b39-9f7e-34e93bef9042/rehras_sahib_download.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_off0000f0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B6 5536 bytes
SHA-256: 66ba3b7823b25c43941cee0b33a56fb8be43cc7acae497fb3ad1b37aebee4429
font_01_sfnt_off00010375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10375 10288 bytes
SHA-256: 440c32555cefd6cf3d3ceb127978f89e52034626a8df87ca52349356055d2d58

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