Malicious PDF — malware analysis report

Static analysis result for SHA-256 b40cd89dca3449a9…

MALICIOUS

PDF

83.1 KB Created: 2021-03-13 19:36:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 28d10867e6d6611d33aba4824e1e1a59 SHA-1: 036bb1b2559e51309127c1db885a01adffc2d95f SHA-256: b40cd89dca3449a9c90a1276a061040c10c92dc6a8e527158a1fb177ba5e062d
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically `https://dafemum.ru/award?keyword=criterios+cetoacidosis+diabetica+pediatria+pdf`. Additionally, it exhibits characteristics of a PDF link farm with numerous external PDF links, suggesting an attempt to distribute or redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/award?keyword=criterios+cetoacidosis+diabetica+pediatria+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4474445/normal_60138bfe6381a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365620/normal_5ffebff2cd67c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373749/normal_6037dfe1e1908.pdfIn PDF document text
    • http://mukumalatixuji.iblogger.org/93548074656.pdfIn PDF document text
    • http://lunenakipusuwi.iblogger.org/silojesax.pdfIn PDF document text
    • http://detobusukited.iblogger.org/99538433185.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/minabiwa/what_are_the_hours_for_walmart_pharmacy_today.pdfIn PDF document text
    • http://nomijedelalevi.rf.gd/feneguvixudow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7684f0c0-5dcc-4566-9977-ee64414b2bcc/how_do_you_read_a_stock.pdfIn PDF document text
    • https://s3.amazonaws.com/sabobenuwe/android_objectanimator_rotate_example.pdfIn PDF document text
    • http://dinukafewu.epizy.com/what_is_a_2009_bmw_328i_worth.pdfIn PDF document text
    • https://s3.amazonaws.com/resabomibogodaw/13404025123.pdfIn PDF document text
    • https://s3.amazonaws.com/wizomoravazub/rizoxamowusak.pdfIn PDF document text
    • http://novoniranalisa.epizy.com/powermate_generator_3250.pdfIn PDF document text
    • http://xidatozekef.epizy.com/definition_of_risk_management_journal.pdfIn PDF document text
    • https://9c43cb74-45e3-47de-9527-fda2e8336169.filesusr.com/ugd/af0aa9_5abfbaec33df4f22accd17a1221468e8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/xuvitobiberutozinigupivak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83ce7a44-81ef-499a-824c-0ebadcf3d791/wosisabavavapuwojumux.pdfIn PDF document text
    • http://mezomiz.rf.gd/juximonurawujadakil.pdfIn PDF document text
    • https://146c8b6c-0b46-450b-8ed0-b45f1e2a4974.filesusr.com/ugd/b58d21_3a0aa92619ce4994bd2f518343764a80.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_off000102fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FA 5160 bytes
SHA-256: ac811c81aa471020b3622f922991ea163164be0179489dec4de3d924a73fc742
font_01_sfnt_off0001148b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148B 12420 bytes
SHA-256: d550f707dc1c3ade0ca18fbb905afda1df2545fb4e621382396771e7bff08d2f

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