Malicious PDF — malware analysis report

Static analysis result for SHA-256 c632614e5dec3075…

MALICIOUS

PDF

77.2 KB Created: 2021-03-21 05:53:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: c3180f079a11bdcc19791e6fada068a9 SHA-1: 90f4254605c810395d6c5985e3abe05f27e16b86 SHA-256: c632614e5dec3075737d58d70ccdc91bebcec033d63ebbcc7d7ac678d12de0ff
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to PDFs, suggesting a link farm or SEO abuse tactic. One of the embedded URLs, 'https://maypoin.ru/123?utm_term=milady+chapter+16+review+questions+answers', is presented as a review question answer, likely a lure to attract users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://maypoin.ru/123?utm_term=milady+chapter+16+review+questions+answers PDF link annotation
    • http://collegegraduatecentraldating.com/red_neutralizer_for_hair3pkwh.pdfIn PDF document text
    • http://braco.ru/isagenix_30_day_cleanse_schedule2mnbe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459483/normal_6056865f88371.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424953/normal_6003b95d18c1f.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/xukanomarexumu/jezawejujibevonil.pdfIn PDF document text
    • https://s3.amazonaws.com/remufuzu/mariah_carey_best_songs.pdfIn PDF document text
    • https://510adc33-753b-44c0-977e-8d34da8fcdd4.filesusr.com/ugd/5f4192_4cb0a1a7ecdb4560a431da4a08084ece.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/90442632843.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/72665004680.pdfIn PDF document text
    • https://b1b1ed1d-a631-407f-b8a0-2f609481a9c2.filesusr.com/ugd/3e5895_d1720b224dad4774a0ec0b5d36d8cae1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gafedupeba/luvonijipeja.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/psychology_from_inquiry_to_understanding_3rd_edition_online.pdfIn PDF document text
    • https://737c154f-ca75-4484-807d-9d5c19d76377.filesusr.com/ugd/7e84b7_616c36d03eb74568b3b86acb7c2c7f59.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/ketasopixodo.pdfIn PDF document text
    • https://77483064-5892-4b52-b419-66e751946b77.filesusr.com/ugd/ef7b09_3bbced8babfa4b78a0fb6349387bdb2e.pdf?index=trueIn PDF document text
    • https://9d50af6f-dbf7-41ba-b854-83985329a12b.filesusr.com/ugd/33c377_9ac2a5672a3b416ba9e9a34b25fe1f15.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wuniku/5867966365.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_off0000f001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF001 5752 bytes
SHA-256: 3a13e6aec5042b38cdbafb9b5d35dccd6df74a09754c701633352ee6188db851
font_01_sfnt_off000103bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BC 10436 bytes
SHA-256: d794824a474320a1b31ee490c09e8c68059e5bbcb72329681f81d952f9cc8644

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