Malicious PDF — malware analysis report

Static analysis result for SHA-256 343d09f755561433…

MALICIOUS

PDF

68.0 KB Created: 2020-11-14 01:19:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 6d184c4c602c4e28127a7c37f3661162 SHA-1: 15ce9d1bf1add19314706ad8b751fad9e163dd4a SHA-256: 343d09f755561433b00b3d301037757ab1e95c46a679ba1868ba63ec5100038f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document is designed to host a large number of external links, likely to facilitate phishing or distribute further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attack pattern involving redirection to malicious sites.

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=new+vegas+confirmed+bachelor PDF link annotation
    • https://vadurevagide.weebly.com/uploads/1/3/3/9/133999829/boxuluf_lufazojinudubiw_nomazimofavud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451228/normal_5fa1aacc95ef6.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/kasuwevovog/silagonexusiwikili.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/68605613192.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11b4eb58-61ec-4e05-a59b-60e7ae4dc51d/tabla_de_funciones_trigonometricas.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/56122235641.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62299dbc-5825-40cc-b5d1-b52099057f7c/7141437030.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56a26097-78e7-435d-bd31-e17eed1139f0/achievement_unlocked_3_walkthrough_google_sites.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb23bf32-3ccf-465d-b76d-ef202814e893/47655097229.pdfIn PDF document text
    • https://s3.amazonaws.com/remufuzu/23047214429.pdfIn PDF document text
    • https://s3.amazonaws.com/fejakixoweka/84183602236.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_off0000c841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC841 5696 bytes
SHA-256: 8d02067dd256bca8a1882637599dd66be3747170bf5fa1a018516bb2d590bcdd
font_01_sfnt_off0000db9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9C 11736 bytes
SHA-256: 91c7d1e814c1990d6dc5ea28c93549e9975658e45478839206a48cdf659bca39

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