Malicious PDF — malware analysis report

Static analysis result for SHA-256 14a1e96f97260a38…

MALICIOUS

PDF

74.8 KB Created: 2021-06-02 18:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5a03526e492d4d5c076770d10048e14a SHA-1: de04dcdf9aa65bcd80c6690ce7c121efcf59d34c SHA-256: 14a1e96f97260a38d50f5ad085eb952adede35e453d1b809a0cac04b844f6265
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 0.9996

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://ketchas.ru/pbw?utm_term=couch+to+5k+running+plan+treadmill PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4377381/normal_600803177fd25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499023/normal_5fd97caa7a2b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417519/normal_5fd644c96915d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387061/normal_60155c2aa5cd6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418972/normal_600a535866f55.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mibegenav.pbworks.com/w/file/fetch/144436872/sexutapemidexep.pdfIn PDF document text
    • http://vawaguzidatu.pbworks.com/w/file/fetch/144424212/82006588735.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e682e7dd-8e2a-44dd-bf6c-875bb373f219/wanna_break_night_meaning.pdfIn PDF document text
    • http://lakebimutep.pbworks.com/w/file/fetch/144418044/57230635203.pdfIn PDF document text
    • http://ziriwuru.pbworks.com/w/file/fetch/144498207/what_is_an_i_9_employment_eligibility_verification_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a991cee-cda6-4e7e-afb5-585b703f05a0/76572545731.pdfIn PDF document text
    • http://gibuwodebu.pbworks.com/w/file/fetch/144489735/nice_guidelines_treatment_of_deep_venous_thrombosis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25e82bd5-3677-4f8c-880f-4b7d07f21955/37399171339.pdfIn PDF document text
    • http://kedetuwi.pbworks.com/f/list_closing_credits_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/459f796b-d89a-4627-9363-973fd9bc176e/list_four_other_characteristics_of_living_things_not_including_respiration.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2ce6499-2056-41e8-97dc-51de94975182/list_of_coordinating_and_subordinating_conjunctions.pdfIn PDF document text
    • http://dipoziw.pbworks.com/w/file/fetch/144439581/bimitowebovaduxusotu.pdfIn PDF document text
    • http://pamotekegopa.pbworks.com/f/la_cura_al_minuto.pdfIn PDF document text
    • http://xosufixemuf.pbworks.com/w/file/fetch/144434223/al_que_ingrato_me_deja_busco_amante_contexto_historico.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b850b5f-a89a-41fe-969f-813d027f9030/panoxesilalavov.pdfIn PDF document text
    • http://tukufidanega.pbworks.com/f/tekken_blood_vengeance_2011_bluray_1080p_download.pdfIn PDF document text
    • http://pulixojesu.pbworks.com/w/file/fetch/144489027/biritinig.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_off0000e5e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E0 5404 bytes
SHA-256: a824a61aade52da9c0f43e6d7b818ac6b3710591821a7626d24d9ede38f85f93
font_01_sfnt_off0000f81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81A 11240 bytes
SHA-256: a6b1abb4fc81c9a49479419391ad86a8bbe658d9befcfee46aad1df32d29a1c3