Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb5513a165e7b03…

MALICIOUS

PDF

82.5 KB Created: 2021-03-24 18:16:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: aaffd55b9fcebae621453deb502a76df SHA-1: 25b245b316b5f43396328426505afe24fda292ec SHA-256: bcb5513a165e7b03586ad715f72903131a5f33d1c2e734d8cce8ea0990b27e49
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/aws?utm_term=best+price+for+beats+powerbeats+pro In PDF document text
    • https://static.s123-cdn-static.com/uploads/4494889/normal_5fcef1416bf89.pdfIn PDF document text
    • http://mowefopovog.mywebcommunity.org/bhagavad_gita_as_it_is_english.pdfIn PDF document text
    • http://fuvidevifa.scienceontheweb.net/blheli_30a_esc_programming.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369648/normal_601bb16ad6965.pdfIn PDF document text
    • http://muwosolop.22web.org/simple_past_tense_verb_to_be.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470968/normal_5feec4cca65a2.pdfIn PDF document text
    • https://cdn.sqhk.co/wasusoguba/bhie1XX/uefa_championship_league_table_2019_to_2020.pdfIn PDF document text
    • http://diletemofuvufu.22web.org/ballast_water_management_plan.pdfIn PDF document text
    • http://bulepozobagepud.mygamesonline.org/zares.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444374/normal_6015d87147bc1.pdfIn PDF document text
    • http://bulakirip.getenjoyment.net/miller_suitcase_xtreme_12vs_parts_list.pdfIn PDF document text
    • http://kufejat.sportsontheweb.net/names_of_countries_in_the_world.pdfIn PDF document text
    • https://cdn.sqhk.co/takoxuwal/N4Ghchd/free_cute_animal_wallpaper_backgrounds.pdfIn PDF document text
    • http://pewekelexu.mygamesonline.org/handbook_of_clinical_anesthesia_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://lizomepikoxi.epizy.com/dump_truck_driver_resume_templates.pdfIn PDF document text
    • https://a4edf7fa-b057-49b5-8014-e5fd436fbef3.filesusr.com/ugd/c8b2c5_0228c5f4df424e2caa5a230df7e42382.pdf?index=trueIn PDF document text
    • https://1a2149e7-ca7f-4e7c-a584-0e483de6f3af.filesusr.com/ugd/9219f8_550086bed9b24dca960adc90370e4c31.pdf?index=trueIn PDF document text
    • http://gajutar.onlinewebshop.net/rumafagiwigemalerasage.pdfIn PDF document text
    • http://sudokutovomewin.rf.gd/nubojugaxi.pdfIn PDF document text
    • https://14da0a27-f261-4d4b-8668-3a369f5c966d.filesusr.com/ugd/46429b_795865ef39e340dfb7d8e4b346a7ab45.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF779 4940 bytes
SHA-256: 379e049df75fd18da848b4d205a87078fca0878edf95c2c08528680f4bd53f9f
font_01_sfnt_off00010860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10860 11260 bytes
SHA-256: 7011afbb04ec32e864f6675f0a6547f9be169307776154a416dd2848fd079ddd
font_02_sfnt_off00012e35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E35 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c