Malicious PDF — malware analysis report

Static analysis result for SHA-256 c57b47ac273bd028…

MALICIOUS

PDF

67.1 KB Created: 2020-11-12 18:45:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b5f6d71549de2d7b475affb2a64910c SHA-1: 74f36bd61c7c970dd30e61c3e743c8e4e16f9e3e SHA-256: c57b47ac273bd0285527266658f9da6d85f2ff61dfb538a5ffb7d4f93aec8562
254 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to drive traffic to potentially malicious sites. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document may be part of a multi-stage attack involving password-protected archives.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://cctraff.ru/strik?utm_term=aprendizajes+esperados+en+primaria+p
    • https://lupojevoken.weebly.com/uploads/1/3/4/4/134468235/85d1809.pdf
    • https://cdn-cms.f-static.net/uploads/4381094/normal_5f96d2cd8e7f2.pdf
    • https://wefolukozik.weebly.com/uploads/1/3/1/4/131406413/vawulimigun.pdf
    • https://vinazawodix.weebly.com/uploads/1/3/4/3/134352366/77f0368d.pdf
    • https://cdn-cms.f-static.net/uploads/4403565/normal_5f9f2db42a3c8.pdf
    • https://togitarusufojir.weebly.com/uploads/1/3/2/6/132681229/9042433.pdf
    • https://cdn-cms.f-static.net/uploads/4365606/normal_5f8f7817c1fad.pdf
    • https://cdn-cms.f-static.net/uploads/4375361/normal_5f8b37ffbc0e2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vavale/stone_memorial_high_school_crossville_soccer_field.pdf
    • https://s3.amazonaws.com/ragejufa/vosupibamovene.pdf
    • https://s3.amazonaws.com/penale/minecraft_cheat_engine_fly.pdf
    • https://s3.amazonaws.com/wilugugo/sahih_al_bukhari_urdu_free_download.pdf
    • https://s3.amazonaws.com/genedesowul/aiou_date_sheet_spring_2018_ma_education.pdf
    • https://s3.amazonaws.com/vopadofugon/tojerivovuvogofasanafep.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8a6.bin
e4d4ebcf2dbf42c28b05d79e36f955ef0121cb408e047479a0f82a1ed0c8d3be		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A6 5188 bytes
font_01_sfnt_off0000da44.bin
e4272ee2f20ccd53575ae657df5b39d918d30c0dc3a17fb38996321df1424048		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA44 10968 bytes

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