Malicious PDF — malware analysis report

Static analysis result for SHA-256 90b1967f1a9f115c…

MALICIOUS

PDF

65.5 KB Created: 2020-11-19 06:41:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 2fb511a0ebcccb9b701a5df2d920fe41 SHA-1: e9e01dceef4f1218ddf7f1ec8964f69f515929cc SHA-256: 90b1967f1a9f115ceba618904906acf5fdce5bacf06df03034a57e454dc17fb5
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The primary malicious URL identified is 'https://trafffe.ru/123?utm_term=fugl+meyer+pdf+espa%25C3%25B1ol', which is likely used for phishing or to distribute further malware. While no scripts were explicitly extracted, the presence of external links and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest a phishing or malicious redirection attack.

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://trafffe.ru/123?utm_term=fugl+meyer+pdf+espa%25C3%25B1ol PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4373240/normal_5f908427f03bf.pdfIn PDF document text
    • https://nukubutoti.weebly.com/uploads/1/3/2/3/132302768/2300220.pdfIn PDF document text
    • https://ranerenonosojib.weebly.com/uploads/1/3/1/4/131483420/449452.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391620/normal_5f9788f5eae35.pdfIn PDF document text
    • https://sesuwulot.weebly.com/uploads/1/3/1/4/131438847/fe7a3a548ffb3.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/rekorewexidiwo/nova_epigenetics_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88de2254-8d73-46fa-bc61-e2fcca0fffa5/recover_deleted_files_app_for_phone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4be72ef-b77b-4676-b8ab-c7f50ce89c5e/watizesa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7b0e89a-5775-43f7-9754-a71202cb9b8f/55883324542.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21b897c5-229e-40c7-b043-7c56fa11695c/lejagilawo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bc3b7ac-da15-4a99-9798-7fc1f47e3de8/44535033523.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afc7bab0-e82b-4427-a070-9bcb2181fe53/buy_here_pay_here_wilmington_de.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_off0000c36f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC36F 5628 bytes
SHA-256: eb9d52706b192392c37435fb2f0f3f65ae1ffef74d5a4e30e4129bec2844e969
font_01_sfnt_off0000d64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64E 10124 bytes
SHA-256: d44c078d525ef298502efda48619e6407c5ff8a9cc8a4394b5bfe594391443ae

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