Malicious PDF — malware analysis report

Static analysis result for SHA-256 2318fc74abc77d0f…

MALICIOUS

PDF

63.8 KB Created: 2020-11-20 06:07:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 89dc787aa6542757c1cc599b08640654 SHA-1: ca0fcb9ad8ac998b186183ba3e64d1a2f1053e91 SHA-256: 2318fc74abc77d0fd072a08782ec065d5a7655c48a96154b47c4449fb2274d37
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs, suggesting a link farm or SEO spamming tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafficel.ru/123?utm_term=how+many+days+till+june+23+2018 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419822/normal_5f9979811cff4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446507/normal_5f9d503dd4756.pdfIn PDF document text
    • https://jamafijuzu.weebly.com/uploads/1/3/1/4/131437216/708661.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371267/normal_5f97841b7c3be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407066/normal_5f972faa4121b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407749/normal_5f92c7e6d4bbd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416656/normal_5f96bdb24286b.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/36f4f81d-2638-4b96-bd4d-eaae6dacbab0/72164627251.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18e16551-e0f6-4c0a-a094-b5724212c716/sap_fico_resumes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51a9befc-e4e0-4d43-bd32-67c67f87f21e/the_odyssey_part_1_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7502f98-6da6-4ee5-b420-81ac8373dcd2/123movies_harry_potter_7_part_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc699f2c-a267-4da7-9498-d892cc5b4e44/download_kisscartoon.is_connection_c.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_off0000bec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEC1 5788 bytes
SHA-256: 9d48c3dd2f458cf1134583037c2e1985014592c0214a17cd8572d1708d7da4fd
font_01_sfnt_off0000d27b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD27B 9436 bytes
SHA-256: 7f1cfec8d8a4794ac598bbc10dfe20dcb5f13689702e077512430216dfe02530

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