Malicious PDF — malware analysis report

Static analysis result for SHA-256 76febc61a6428349…

MALICIOUS

PDF

70.8 KB Created: 2020-11-11 21:55:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: e6813e4045839159d9f69f1a8553814e SHA-1: d826ad3383d8cd96cec1a40b860e1db57f5a5ad4 SHA-256: 76febc61a64283494e4b33c96a55f15ad5566e029c312ae2da7953d6e06d3c5d
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with one critical heuristic identifying a link to a known malicious redirector. Another heuristic indicates a large number of external PDF links, suggesting a link farm used for SEO poisoning or distributing malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • 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://traffking.ru/aws?utm_term=bharathiyar+songs+pdf+free In PDF document text
    • https://gebaxugore.weebly.com/uploads/1/3/4/5/134594027/lobuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366029/normal_5f89ee8edf150.pdfIn PDF document text
    • https://wuxurabe.weebly.com/uploads/1/3/4/6/134608123/c32726ad21c6b.pdfIn PDF document text
    • https://jojawetoterul.weebly.com/uploads/1/3/4/4/134404105/9957427.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/gagagakigibapo/ask_the_dust_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/panel_schedule_template_excel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d80a1983-24b6-4a8f-8cbf-d854019e9530/59437771475.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15285257-0caa-4700-85a1-898f16d5cfee/13833862556.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dfc7154-f8ab-44ee-92f0-ad8313d56f9f/kizewimafuguv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e3514cc-a64a-4fb9-aae1-ef460144b5b0/saturday_night_misfits_tab.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_off0000d919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD919 5420 bytes
SHA-256: 81058f89683770c9a30a61724199c8d48250eace1f3dc46a8064aae071b5b9ff
font_01_sfnt_off0000eb93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB93 10272 bytes
SHA-256: 9bcfffe05696f4392a2f4b1b579f24516f73f2fc87aa662c14992c294df98214

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