Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa4fd6b27c92b940…

MALICIOUS

PDF

62.4 KB Created: 2020-11-20 15:19:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1e89639e1b2c0f4d4bd17c43a5aba01e SHA-1: 90334b41b276e137fa071bf0eba26fe08d1f9088 SHA-256: fa4fd6b27c92b940433abd6d60d4b56ccdb3d7bc2dc5fce43ffe63dcb4056ffe
156 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many of which point to PDF files, suggesting a link farm or phishing attempt. The primary URL, https://traffnew.ru/strik?utm_term=rafael+orozco+novela+todos+los+capit, is likely used to redirect the user to a malicious site. No scripts were extracted, but the PDF structure and link farm indicate a malicious intent to redirect users.

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://traffnew.ru/strik?utm_term=rafael+orozco+novela+todos+los+capit PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4389793/normal_5f8f0370abcf6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385436/normal_5fa593eb7f0ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368777/normal_5fa6d83f94da1.pdfIn PDF document text
    • https://wawawafux.weebly.com/uploads/1/3/4/8/134896626/4908634.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/aaa06537-91df-419b-b6c5-aad715b6388a/funegos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d77f770d-ace9-420d-ba46-084a53fc2bb2/67795740113.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c57c0527-13f2-432d-824e-79a11550ab37/noluxaroxuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/deb68bf2-5677-4c56-bd91-586ed0c202c7/rockstar_full_hindi_movie_download_f.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd21fb34-aa0f-4b22-8384-9eb1d278292a/rogabitewoto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/829266ba-9fd7-49d8-b4df-b1e35e745a9e/94833547422.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dc01eef-56d5-4e2f-b9c6-7836870489e1/8209766627.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86628c63-4b93-4921-8a12-f48e489b2f50/bivovibila.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_off0000b768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB768 5268 bytes
SHA-256: 63f2b914b084139f9fd9335856c7a0916d38114bfbf60d736b778c9e1b8a6d70
font_01_sfnt_off0000c97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC97B 10460 bytes
SHA-256: e12847bc9a9d205c7d26d2f1c849808063423823e2e5aa1af6656b64df37a829

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