Malicious PDF — malware analysis report

Static analysis result for SHA-256 5da64ba7a05302fa…

MALICIOUS

PDF

75.6 KB Created: 2021-05-24 22:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: f29cbbc3132bfc47983f66e17afa5e0a SHA-1: 98ea9b17b42f231e4b396f122c32780200563f84 SHA-256: 5da64ba7a05302faae68ccb7adebe1686f5aaec9b4ce3132643d1cdec7924daa
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of external links, suggesting a link farm or redirection strategy. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URIs indicate a potential for malicious redirection or exploitation, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://static.s123-cdn-static.com/uploads/4465557/normal_5fceb3d3f0eea.pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4490244/normal_6033c2fe65231.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422137/normal_603b185576eb4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450876/normal_6037b92d9146e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407331/normal_6031968f3a207.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486206/normal_5feb3059079d6.pdfIn PDF document text
    • https://dezijetide.weebly.com/uploads/1/3/4/8/134864221/lavito-lesojotenifaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424991/normal_5fd63c585d40e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459337/normal_600e67a3b35ca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406168/normal_6006da126be6d.pdfIn PDF document text
    • https://fukuperuka.weebly.com/uploads/1/3/4/8/134883813/8538535.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475730/normal_6049b5242541b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413113/normal_5fc903ddb3b7d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503791/normal_5fe5972423d2d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492529/normal_6000fe97c5c56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505363/normal_601ff765237fd.pdfIn PDF document text
    • https://lopekemin.weebly.com/uploads/1/3/4/6/134628767/930ed9b44521ad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/3IgsHNHpEfs/wb?keyword=how%20to%20lose%20weight%20with%20trxPDF link annotation
    • https://uploads.strikinglycdn.com/files/b0e19713-c2e7-4d1d-ae7b-3957d528b626/inverse_trigonometric_formula_download.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/lol_support_warding_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/57199528001.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/890670d7-3159-470e-8630-be79267a062c/viluxulovebomevilewodedar.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/78736751568.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_off0000ea27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA27 4856 bytes
SHA-256: 8b39a49bca8c9e0ed3e8514f3e8081ef4cfccd8e1b6f30716be47c2995b5917b
font_01_sfnt_off0000fabb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABB 10780 bytes
SHA-256: ecba1b9ee8c381219d21d2e85382cde6597763f3e46165eac20a78dbabf0db40

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