Malicious PDF — malware analysis report

Static analysis result for SHA-256 d681d7a811a27343…

MALICIOUS

PDF

80.2 KB Created: 2021-03-18 13:37:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f7ae48a8216c960561a4b28da4eb1749 SHA-1: 9ebce6fe541722293fd7e1ebc5e02c470437290f SHA-256: d681d7a811a27343820c4b95bb5ee75e3241383a84da6e3be313e1b3164ce949
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 0.9994

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://jacksth.ru/aws?utm_term=le+petit+prince+quotes+fox PDF link annotation
    • http://rijapefijap.22web.org/tasheel_e_bahishti_zewar.pdfIn PDF document text
    • http://xoxanuf.mygamesonline.org/rodirizu.pdfIn PDF document text
    • http://pexulisinipev.sportsontheweb.net/btec_level_3_business_book_1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488572/normal_603082ec14ee8.pdfIn PDF document text
    • http://fasekafalig.scienceontheweb.net/how_to_replace_a_whirlpool_refrigerator_ice_maker.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467601/normal_5fedcf1a9bcbc.pdfIn PDF document text
    • https://cdn.sqhk.co/temirikuji/jgjjehi/13749469013.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374698/normal_5fd15ba876b16.pdfIn PDF document text
    • http://vazawujuzu.sportsontheweb.net/muscle_growth_workout.pdfIn PDF document text
    • https://cdn.sqhk.co/juvowisire/fZODAp5/alter_ego_salon_peoria_il.pdfIn PDF document text
    • https://cdn.sqhk.co/mowogibewu/GeP2lhg/movadutusazoja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489032/normal_605155bf56853.pdfIn PDF document text
    • http://gadazagowuvared.iblogger.org/gujoroj.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/27900ce2-9c32-49c3-9cea-ef76934596bd/how_to_cite_a_mobile_app_in_apa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58bc0aed-b734-474e-be5a-b44406b4582a/seagate_backup_plus_desktop_drive_srd00f2_4tb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1497d59-5ac5-4716-bbbf-cbcdfea0e369/28077817200.pdfIn PDF document text
    • http://korofituzuxigu.onlinewebshop.net/mastoiditis_tratamiento.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8df66fdc-5a25-401e-a4a9-4cfc4ba90fd6/76377894320.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/019bc8ae-1df0-4dce-9202-2a511846a3c4/subway_surfers_hile_indir_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a558a80a-09ca-4b0d-9200-596552f13a7b/m50_joint_service_gas_mask_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c36d0bc-a14b-4cee-b0d3-0810d1b1fd23/64837866971.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abfd540f-4ad4-4a02-94c9-8b1fc3bc0a20/my_husbands_secret_twin_movie_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c142472-2cb3-4e81-afcc-e8e1a2dbe72b/what_is_the_millers_job_in_canterbury_tales.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_off0000fde7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE7 4900 bytes
SHA-256: 3c607932cd99176e84970725231749a47309ae47f4656cf1317baac321cdd96f
font_01_sfnt_off00010eb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB9 10424 bytes
SHA-256: 08c447e3ba9a72f9d5ff11dc707ec4d189cc2173786463d7c96a52bae7cb0105