Malicious PDF — malware analysis report

Static analysis result for SHA-256 62b8a817b49ba644…

MALICIOUS

PDF

76.2 KB Created: 2021-02-15 03:57:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1945965cec49362bd4e3465647670aba SHA-1: 12f9ced03c7adc8777cc75923544f818c0e78c21 SHA-256: 62b8a817b49ba644d04753fddad33384b78edc6767363db4f43c138bc9662c46
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file is a PDF containing numerous external links, many of which are associated with SEO link farms and one specifically identified as a credential phishing lure impersonating Facebook. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://jakineporop.weebly.com/uploads/1/3/5/3/135302356/fixume_fetuvaxag.pdf.
  • 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://leonvi.ru/wix?keyword=night+chapter+1+study+questions+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465949/normal_6029d0eb1afb6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409798/normal_5fc714f7076b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408879/normal_600ea9dcda444.pdfIn PDF document text
    • https://jakineporop.weebly.com/uploads/1/3/5/3/135302356/fixume_fetuvaxag.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459788/normal_5feb7cbd942af.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484115/normal_5ffabeb6ca5fd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369187/normal_5ffa4da99a4a1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483337/normal_6003dd35762b3.pdfIn PDF document text
    • http://a1metromovers.com/majeginuvubekarujawodoprapeq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485172/normal_5ffdd26397f29.pdfIn PDF document text
    • http://vknacruckalaikov123.xyz/download_limitless_movie_in_hindiw2eqh.pdfIn PDF document text
    • http://fallofelin.online/gavafofotelojazozuluvufiqdyfv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471455/normal_5ff5ffcc488ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408990/normal_5fd9aa6ee9706.pdfIn PDF document text
    • http://homiak.fun/41832474451vpj8h.pdfIn PDF document text
    • http://thecet.xyz/6648056381232ka3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387712/normal_5fdd21c7e1c18.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE118 5524 bytes
SHA-256: 431aa1e286d3b47f5059df085e9be3b63de7e30c373c144556eede8721e66cfc
font_01_sfnt_off0000f3f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F3 9880 bytes
SHA-256: 7eda6f6c3acb2a021bdcf50310faacdeab8d9d8165f5139220287259d95ab8fb
font_02_sfnt_off000115be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115BE 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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