Malicious PDF — malware analysis report

Static analysis result for SHA-256 19a72e0c3f270940…

MALICIOUS

PDF

77.0 KB Created: 2021-01-16 00:17:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 8a04f2163b477d80594980e3ca5be891 SHA-1: bacb0d55f7021f0b1daf4e57b8808c9781ade35b SHA-256: 19a72e0c3f270940c187e67e09ae56a3b32688e60449cb9bdad69b9b9de1c6e8
154 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, indicating a phishing attempt. The document body, though heavily obfuscated, contains text that suggests a lure related to an employee handbook. The presence of embedded URLs and the ML classifier's high confidence score support the classification as malicious. No scripts were extracted, but the primary attack vector appears to be a phishing link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://traffine.ru/123?utm_term=j+crew+employee+handbook In PDF document text
    • https://static.s123-cdn-static.com/uploads/4402000/normal_5fc7033b62648.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446492/normal_5fa5292c829b5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448542/normal_5fe564f05241a.pdfIn PDF document text
    • https://site-1176922.mozfiles.com/files/1176922/5090570259.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369498/normal_5fa21981523b3.pdfIn PDF document text
    • https://cdn.sqhk.co/guxuboru/B1V8jid/capsaicin_weight_loss_reviews.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375342/normal_5f8b1e49d0d6f.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/tosego/email_format_validation_using_jquery.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/venn_diagram_printable_form.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/rulab.pdfIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/new_bangsamoro_basic_law.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_off0000f19b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19B 5524 bytes
SHA-256: 825b0179327ffa5f59d663b5f1ab9111a2f2c73540d7de4ce5edaf63fbaece00
font_01_sfnt_off00010446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10446 10244 bytes
SHA-256: 521d3e786233542ff0803639dca5de7715abe3c964342feeba2aec42223ba655

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