Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd3bb31867473879…

MALICIOUS

PDF

73.2 KB Created: 2021-03-27 20:01:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 7b6dd65009548d3abb228269b3b3f182 SHA-1: 28a522c73020707e59e0ec514bd83d8687c6dcac SHA-256: fd3bb318674738792067454d7fef12b7066d180d8d8197be44952166c3c7341a
126 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URIs, with several pointing to disposable hosting and potentially malicious domains, suggesting a phishing or malware distribution lure. The presence of embedded URLs and the overall structure strongly suggest it's used as a delivery mechanism, likely via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://midufefew.ru/123?utm_term=bubble+shooter+2015+apk PDF link annotation
    • http://mstmail.space/havoc_demon_hunter_mythic_guidelc724.pdfIn PDF document text
    • http://center-san.ru/statistical_quality_control_toolskcffh.pdfIn PDF document text
    • http://ehaberdevlet.com/vejibu7wh4s.pdfIn PDF document text
    • http://vostokzapad.su/my_computer_information_windows_7_downloadsdgda.pdfIn PDF document text
    • http://todayshop.website/rupevimaudzho.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408873/normal_605bcbf30690a.pdfIn PDF document text
    • http://interior.estate/lunawi2qchm.pdfIn PDF document text
    • http://stnold.com/irregular_verbs_list_exercises_printablerm484.pdfIn PDF document text
    • http://g2am2e.xyz/saree_blouse_designs_catalogue_free_downloadjqqbm.pdfIn PDF document text
    • http://sport-stavki.fun/312097085743fr07.pdfIn PDF document text
    • http://freds.space/528367856505aben.pdfIn PDF document text
    • http://mabay.fun/9770737926730l7k.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385410/normal_5fdfdd44e5eec.pdfIn PDF document text
    • http://imm-shoes2.club/how_long_was_the_great_depression_in_americaa3x52.pdfIn PDF document text
    • http://supsun-aero.com/meduxapa1b2gm.pdfIn PDF document text
    • http://hamlikjorettoop.ru/17015418870tkjmd.pdfIn PDF document text
    • http://cashfree.store/do_restaurant_employees_get_free_foodxcojp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/akinator_full_apk_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/3802296402.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4226375e-e308-473f-a0f0-46a404682570/netters_anatomy_flash_cards_app_free.pdfIn PDF document text
    • https://s3.amazonaws.com/dupula/48278490874.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f34d4046-8d88-4033-8f01-f3abac814106/masterbuilt_mes_230g_bluetooth_digital_electric_smoker_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/android_gmail_account_sync_is_off.pdfIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/witigu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45cfd148-6f01-478b-b57f-2bbcf08b7c70/27850025044.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a1c663b-f707-4ae1-854c-7153a99f2de2/what_is_the_difference_in_i-pilot_and_i-pilot_link.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_off0000db90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB90 5612 bytes
SHA-256: 6d3e27a4fbeabb44ce610fdd29c8123129383350f071f09d117a0f3e2fc9b1f8
font_01_sfnt_off0000eea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA1 11984 bytes
SHA-256: da4bf4449f63df3ff155ae0c0beec69f3930cb5144ee98755331c0290109ae0a

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