Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4f66b89459373d2…

MALICIOUS

PDF

79.5 KB Created: 2021-03-19 10:15:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: bcd83f06ea995e42eeca90a7b1fae287 SHA-1: a01313eb2ca2096df602171cc7e7ea9952a388b3 SHA-256: c4f66b89459373d21eff1d00d15d38d41333689291243715ea36bec8051e8363
194 Risk Score

Malware Insights

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

This PDF document employs a common lure by mimicking a 'return policy' to entice users to click on embedded links. The heuristics indicate a significant number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://vilenefex.ru/wix?keyword=dsw+return+policy+after+60+days PDF link annotation
    • http://affilateapp.online/tixupoparuwixexobchl10.pdfIn PDF document text
    • https://lefazuditipuk.weebly.com/uploads/1/3/5/9/135967508/cbe378c3.pdfIn PDF document text
    • http://suwufexez.sportsontheweb.net/39178952633.pdfIn PDF document text
    • http://lumogodasekepi.mypressonline.com/guia_examen_toefl.pdfIn PDF document text
    • http://zumepaposakuf.scienceontheweb.net/uglies_series_book_5.pdfIn PDF document text
    • http://cabinetsly.xyz/actividades_de_lectura_y_escritura_para_primer_grado_de_primariawoq07.pdfIn PDF document text
    • http://kobivoweder.mypressonline.com/revugomitebilutexer.pdfIn PDF document text
    • http://piriveva.scienceontheweb.net/google_apps_script_tutorial_espaol.pdfIn PDF document text
    • http://tovelksa.website/physical_and_chemical_changes_quiz0u4fh.pdfIn PDF document text
    • http://talemine.getenjoyment.net/etiology_of_autism_spectrum_disorder.pdfIn PDF document text
    • http://soinjaga.ru/8132195258090oxb.pdfIn PDF document text
    • https://vatopefo.weebly.com/uploads/1/3/1/3/131398509/nuxasezuxagefo.pdfIn PDF document text
    • http://yachtcharter.group/4004184540ulcl9.pdfIn PDF document text
    • https://gesogakit.weebly.com/uploads/1/3/4/5/134581759/8081761.pdfIn PDF document text
    • https://dorikorojuj.weebly.com/uploads/1/3/3/9/133987202/gipelolite.pdfIn PDF document text
    • http://ronifibofizet.medianewsonline.com/aviation_news_may_2020.pdfIn PDF document text
    • http://bezerojiw.scienceontheweb.net/13491541072.pdfIn PDF document text
    • https://pitazifuriza.weebly.com/uploads/1/3/0/9/130969431/batenuwezuvaluluz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sidepojedava.myartsonline.com/how_to_build_a_creeper_farm_1.16_java.pdfIn PDF document text
    • http://tavamikilav.myartsonline.com/rezolagipev.pdfIn PDF document text
    • https://f9fc249e-2e6a-4908-9eb0-88005465a50d.filesusr.com/ugd/2530ee_9db6a5fcfc614a16965bec41a265d664.pdf?index=trueIn PDF document text
    • https://4a5bfc55-71df-4474-8f3e-9f6aca65c64b.filesusr.com/ugd/29b6ce_b644ca251c2245e29007646230807060.pdf?index=trueIn PDF document text
    • https://4407eba0-147d-4e9d-98ff-19010b67f466.filesusr.com/ugd/c1f2fd_195f23437e7e44b980c67912c0c0e025.pdf?index=trueIn PDF document text
    • https://2eeb51df-07ba-4372-80d9-1ef4646fc7f7.filesusr.com/ugd/6af210_73057769ee264fe898a1f2cb0732f9be.pdf?index=trueIn 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_off0000f714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF714 5640 bytes
SHA-256: 32a79d2861f8e62dc09331251e8c83465159f9a4d08c75971cfa187c5cbc1e0a
font_01_sfnt_off00010a76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A76 11396 bytes
SHA-256: 87164a9b3f39f6efc730ddd90f88b05d4a59458b072f245bfe1f1590d5fb59db

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