Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b82021e6e6f4cbd…

MALICIOUS

PDF

77.5 KB Created: 2021-03-12 20:50:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4a852a98fdd9dcfdb1f82a00c675a44 SHA-1: bb0f07ed6c75e04c9c51935742cd64ace37a5079 SHA-256: 8b82021e6e6f4cbdccb0639f70e9ae4de8387e01e16449b2e42e8e74bb18815c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious phishing content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm for SEO manipulation or to host malicious content. The presence of external URIs suggests the document is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/123?utm_term=elmwood+park+nj+police+reports
    • https://vetolotex.weebly.com/uploads/1/3/1/3/131379132/0d2874.pdf
    • http://manidat.sportsontheweb.net/marriage_biodata_maker.pdf
    • http://revodegasiger.sportsontheweb.net/adjetivos_en_ingles_y_espaol_para_describir_personas.pdf
    • http://vukesis.iblogger.org/busix.pdf
    • http://robugipunebib.mygamesonline.org/will_power_book_2_ghost_have_a_season_2.pdf
    • http://zifeladawu.scienceontheweb.net/refrigeration_air_conditioning_and_heat_pumps_fifth_edition.pdf
    • https://pevusipifo.weebly.com/uploads/1/3/4/8/134863194/lominaz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://laletowizoz.epizy.com/blue_jackets_manual_18th_edition.pdf
    • http://zofekaxezujujom.rf.gd/relation_of_voltage_and_current_in_transformer.pdf
    • https://24a70dd4-b549-4b9e-9c0a-6eea45ab85ad.filesusr.com/ugd/ab0c63_c8652a3291c34e5ab9c4d68cfdc3aca3.pdf?index=true
    • http://fazafof.rf.gd/newegoremixufufaxuxikolig.pdf
    • https://uploads.strikinglycdn.com/files/9fb200f2-1cca-4d97-9768-22f759a87512/how_to_write_slope_intercept_form_into_standard_form_or_vice_versa.pdf
    • https://2703069b-a6ff-4ff9-983c-db139a8d76ba.filesusr.com/ugd/8b61cf_44d328fa6a6b44b5813da7fd0ad23e34.pdf?index=true
    • http://gakupoxefale.epizy.com/internet_security_ppt_template.pdf
    • http://zisukuvi.atwebpages.com/91740009459.pdf
    • https://uploads.strikinglycdn.com/files/b26b87e7-4c49-41fd-8710-1e72e7ddd424/the_distance_between_us_chapter_10_summary.pdf
    • http://filosoko.onlinewebshop.net/alphabet_anglais_et_prononciation.pdf
    • https://uploads.strikinglycdn.com/files/536bc708-b47b-4f94-b9ab-edf438295123/irobot_roomba_i7_price_australia.pdf
    • http://wenares.myartsonline.com/aieee_2020_question_paper_with_solutions.pdf
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_44f47db3e798441fb7514ef0accf2efe.pdf?index=true
    • http://tavoxelelenasi.onlinewebshop.net/67472599651.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e42d.bin
418ddfeb2d5265dab3d676d8aaadfa8e485c47a50693a58129c315ad4b8d3919
pdf-font-stream PDF embedded font (sfnt) at offset 0xE42D 5196 bytes
font_01_sfnt_off0000f5d6.bin
3b71dd2d817dd527323a69bf019e8b1bba3eaf2045af6637fb69964e752a1cd1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D6 10812 bytes
font_02_sfnt_off00011a9f.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9F 4324 bytes