Malicious PDF — malware analysis report

Static analysis result for SHA-256 d59aff0df2afac72…

MALICIOUS

PDF

79.9 KB Created: 2021-04-30 12:51:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 6a2c36f6709b4b9784530420031d14dd SHA-1: 35d724f4c9332864eb45be51048a36daaf431385 SHA-256: d59aff0df2afac72cc7c1615437860508d5bcb5c95c8bc698547a22237efaecb
66 Risk Score

Malware Insights

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

The PDF contains a high number of embedded URLs, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content or phishing sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 4

  • 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://bologen.ru/strik?utm_term=meade+etx-60+refracting+telescope+d60mm+f350mm PDF link annotation
    • http://tijudiwulewanuw.getenjoyment.net/diwivo.pdfIn PDF document text
    • http://fibaxoxadomi.sportsontheweb.net/desirenerem.pdfIn PDF document text
    • http://lazirog.mywebcommunity.org/tisesobugakuvobebel.pdfIn PDF document text
    • http://vudifabofugejij.medianewsonline.com/45139262763.pdfIn PDF document text
    • http://kovatafob.mypressonline.com/como_baixar_iphone.pdfIn PDF document text
    • http://vovavipegum.getenjoyment.net/wotif.pdfIn PDF document text
    • https://vutakajar.weebly.com/uploads/1/3/4/8/134896426/4536a7ad2.pdfIn PDF document text
    • https://noberewesuxo.weebly.com/uploads/1/3/1/3/131379636/divikof_kiwutil_faforomi.pdfIn PDF document text
    • http://winovigamaj.mygamesonline.org/30120999194.pdfIn PDF document text
    • https://salexutoxor.weebly.com/uploads/1/3/4/7/134761189/432723.pdfIn PDF document text
    • http://zarumesa.mypressonline.com/mini_generador_eolico.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://balazetesu.epizy.com/62707219428.pdfIn PDF document text
    • https://a35aa970-3e4e-4c20-be1f-53d10001bce9.filesusr.com/ugd/af4e73_5d1da2e403094b59b588844936240450.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/najipavez/what_is_the_salary_of_a_clinical_laboratory_scientist.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/john_deere_mowers_at_home_depot.pdfIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/surilawixapuk.pdfIn PDF document text
    • https://3a5aa097-47f9-475f-9992-83bceef25cc3.filesusr.com/ugd/f55bec_c587f57d81844c8d80ffc5cd9648b418.pdf?index=trueIn PDF document text
    • https://944bcc21-9f45-42c2-9889-8cf837fa5d1c.filesusr.com/ugd/50f869_615abc9152ab46569373df78e298987a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xofalepelala/jegupaduriwije.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/arabic_english_parallel_bible.pdfIn PDF document text
    • http://tozibuxadotoba.epizy.com/duxonuzematinixuba.pdfIn PDF document text
    • http://bolirazebaf.myartsonline.com/jekutaxekuju.pdfIn PDF document text
    • http://buzaduvopixu.rf.gd/quadratische_gleichungen_faktorisieren_aufgaben.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_off0000f7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FF 6164 bytes
SHA-256: 2c5bcf4f98b913959216a4a65aec8f424187a4e55f9146a17f651ba2a6a4eba0
font_01_sfnt_off00010cfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFA 10708 bytes
SHA-256: da69f94ee3dbda822c49c9cf0ea87463415cc6853f6565acbe841d47d350b2b1

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