Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f61957464d23b01…

MALICIOUS

PDF

80.5 KB Created: 2021-03-24 19:42:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 34c1a3f3c35dc8323e608f1e4a85fd4d SHA-1: 11c66f6b914f894c90eb7c635b740d5af174d8fa SHA-256: 8f61957464d23b013db981bacc7a28e63fb9568bda9cf9788ff43eabdfc3194a
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://pelibifir.ru/award?keyword=porifera+canal+system+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4480382/normal_5fd92ef8c2dcc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478422/normal_605671c863bb0.pdfIn PDF document text
    • http://tifusavegapawuf.mygamesonline.org/ceidg_wniosek_2020.pdfIn PDF document text
    • http://vosajizegek.mypressonline.com/3383280578.pdfIn PDF document text
    • http://kavelokafozi.medianewsonline.com/lojudegezikonede.pdfIn PDF document text
    • http://xariketixagat.mypressonline.com/britax_car_seat_installation_rear_facing_latch.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423460/normal_6028e478364ef.pdfIn PDF document text
    • http://bumufirila.mygamesonline.org/requisitos_para_ser_policia_judicial_en_mexico.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457590/normal_5ffe7e4180a69.pdfIn PDF document text
    • http://bukuminuwakub.mypressonline.com/30891276685.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sipanokule.onlinewebshop.net/wikofikowalepaxagoxaded.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/21754510389.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/math_integers_practice_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0c3b710-5bca-464a-8da3-a1f0e6765fd4/bushnell_telescope_voyager_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad80b934-ef1d-43ab-ad7d-0157589b9f86/dugozaxosigin.pdfIn PDF document text
    • https://s3.amazonaws.com/pewibim/direct_and_indirect_speech_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af3d15cf-7ce0-459d-be3b-cb773f7f843e/41808913299.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f58f8d7a-198c-45dd-94c8-18f011102af5/emma_jane_austen_espaol_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da674aca-80f2-4df7-b82e-517e85a3344e/59546429982.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9cacd9e-a5ab-41cc-92ba-729e440f5bfd/57039325024.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5817ccaa-711c-4b9d-925d-d02cab762367/69302617326.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88e794c7-3f56-49a7-bbb8-1164ac7795ef/76826170484.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/eleanor_and_park_summary_shmoop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/508c357a-78a9-4408-83f7-4443fade74dc/fadelewagaxubifi.pdfIn PDF document text
    • https://s3.amazonaws.com/wiremeresegikon/free_business_card_vector_design_templates.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_off0000ff34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF34 5404 bytes
SHA-256: 8bdf21e9a874f54e0db77ce449619336513d310a14294b3cadf95250e0e5ead4
font_01_sfnt_off00011182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11182 10140 bytes
SHA-256: e8934282e5a90e155a8d2004cb9af516a62923a409144a2bc3540e7ef1810a0b