Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9b83ee0e5415e5e…

MALICIOUS

PDF

98.6 KB Created: 2021-03-15 01:23:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c7559bec772d8c75af999f9117dff0c3 SHA-1: 5c9b34fb7d0571358fb12760852ae876f7f52321 SHA-256: c9b83ee0e5415e5ec4e9780ae295c2a6a219cca9c3fac376ef1e05cc2ba79e35
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://crophysi.ru/strik?utm_term=french+grammar+rules+summary PDF link annotation
    • https://cdn.sqhk.co/rapovixovuti/yfeXjiU/history_of_world_civilization_to_1500.pdfIn PDF document text
    • http://filanion.online/executive_command_icivics_worksheet_answerstrjtc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482009/normal_5fe6cb9d80069.pdfIn PDF document text
    • http://custits.space/is_chinese_cinderella_a_true_storybhwe0.pdfIn PDF document text
    • http://megalit-korolev.ru/1st_grade_math_frog_yoga_practice_workbookwv9lj.pdfIn PDF document text
    • http://the-glow.ru/853593490485romr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419847/normal_602403b03699a.pdfIn PDF document text
    • https://cdn.sqhk.co/zarepowake/iigghgc/35932027686.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495988/normal_601dbd1d8d1f4.pdfIn PDF document text
    • https://cdn.sqhk.co/woxemumi/wzxmxig/71962441301.pdfIn PDF document text
    • http://xujimutisep.iblogger.org/visual_basic_6.0_books_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467571/normal_5ff6d29f1fbf0.pdfIn PDF document text
    • http://depupejaxidolip.22web.org/22296413817.pdfIn PDF document text
    • https://cdn.sqhk.co/padasagam/iaxjb29/mp3_mp4_player_app_for_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492250/normal_603c2ffbafb48.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/b258465f-0718-4fa1-a132-d32483321872/which_roomba_is_best.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00989ad9-e259-44a5-8d0a-c216cb1aaeb5/lista_de_verbos_irregulares_en_ingles_en_presente_y_pasado_simple.pdfIn PDF document text
    • http://temomel.rf.gd/2014_cadillac_srx_4_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7385bc53-69bf-4d07-9a68-e6c7372a4a4f/best_sword_fighting_styles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/629f1b25-542e-42dd-95ca-add3bdd86b93/1727471699.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8145cbe-f95f-4146-82e2-d0c4d5c81648/what_breakfast_items_are_gluten_free_at_mcdonalds.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da2bd421-699b-4919-aca5-2eff056f5bcf/28042080528.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87d91807-7eb2-4643-a31a-4900a3998c1d/foraxofe.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001269f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1269F 5268 bytes
SHA-256: 23df3123e5d9fe8f9a5be3ce920980c30eb05a5d01bc2ebe72846812491e3cbc
font_01_sfnt_off0001386e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1386E 14128 bytes
SHA-256: 0759b7b40e41a28ebfaef7d38c3c540546e6fd1949186cd601c70fecb656cefd
font_02_sfnt_off00016605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16605 16100 bytes
SHA-256: e5355abaff8fcab33ce34e55931ff21a393705a3507c9049660e5b960e5a87d8