Malicious PDF — malware analysis report

Static analysis result for SHA-256 23ea79f780a04c97…

MALICIOUS

PDF

67.8 KB Created: 2020-12-11 11:05:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 92200b530558214c95a62d654c24f6ca SHA-1: 2d0d028d42c58daaf986f1a0f5dd71533a4c4cf8 SHA-256: 23ea79f780a04c9762a049f42d290d2de9d24e111981ff996cd02a77ae4f5154
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users to potentially harmful sites. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were directly extracted, the PDF structure and embedded URIs point towards a phishing or SEO manipulation tactic.

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://trafffi.ru/strik?utm_term=my+time+at+portia+a+new+friend+bug PDF link annotation
    • https://falibapop.weebly.com/uploads/1/3/3/9/133997194/gepepura-mabodulabax-dugarofu.pdfIn PDF document text
    • https://zonepebitebebo.weebly.com/uploads/1/3/4/3/134369254/xoxipiteviwi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376870/normal_5fc3ddcc9c3fe.pdfIn PDF document text
    • https://mofasabopileb.weebly.com/uploads/1/3/4/1/134109330/jokanip_finukoro_wiguka.pdfIn PDF document text
    • https://vedokaxo.weebly.com/uploads/1/3/4/5/134529556/fb323efd892635.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367905/normal_5fb6a67314b43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491436/normal_5fae0c343df9d.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/jajuzasalikirut/algebra_factoring_worksheets_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/43166602723.pdfIn PDF document text
    • https://s3.amazonaws.com/pubopelej/employee_handbook_templates_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sewamos/92478595470.pdfIn PDF document text
    • https://s3.amazonaws.com/juzalizuvar/83258840204.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/past_simple_sentences_examples.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c11e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC11E 5492 bytes
SHA-256: cab6a85f74d8a3bfe35a70042692fef893ae2e6ac1b42c79fa4119d1801629fa
font_01_sfnt_off0000d3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D0 2188 bytes
SHA-256: b672ed32057b611730be586441f877a1b206a236b78c91f14c1564547a1c78c7
font_02_sfnt_off0000ddd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD7 10744 bytes
SHA-256: 7a4d3e1434dd8e044494cc7e5384343d1f8bf0667f02e51f85aa5409db4bbe74

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