Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc4f9e474999c2bd…

MALICIOUS

PDF

74.0 KB Created: 2020-12-18 04:43:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 8a98cb542a15d87e77b9311b4d652a74 SHA-1: 17b4d27b8e52133e08d22cfb8aa189d43a8a5196 SHA-256: fc4f9e474999c2bdd13a6ab6bc49b6dd905a93cb99666e9a7b207d48b71c9c3d
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with at least one pointing to a known malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' strongly indicate a malicious intent to direct users to harmful sites. The ML classifier and ClamAV detection further support the malicious nature of this file.

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
  • 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://cctraff.ru/strik?utm_term=kuji+kiri+spells In PDF document text
    • https://numuluga.weebly.com/uploads/1/3/4/3/134307024/kerejudajisogu_wifipu_ridelaxu.pdfIn PDF document text
    • https://tadinitalu.weebly.com/uploads/1/3/4/7/134744808/abce1663a0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408702/normal_5fc535ebe566b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475730/normal_5fd101a4704bd.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/a7352bff-e21b-4aa2-b147-c21b84d03fef/kubaximotawitilom.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0dd9b8ef7301f8b108504/t/5fc2988de6d49a06bbe75131/1606588557555/directv_deca_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c51c489-4ae2-48e6-8a86-b4d5e7b4c788/24208365350.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a314c94-e314-4c9b-821e-4417341df98b/zimip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acc847a3-c693-4999-8069-35dcf4f85647/funewifujix.pdfIn PDF document text
    • https://s3.amazonaws.com/naranofinovujix/daposorosuzukis.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/76092820034.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99144c07-9bc8-4720-a855-5a18a5c57bd5/zero_order_first_order.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4c8ea0b6b03258f4e486d/t/5fd7040789566e781f659061/1607926795085/27790103521.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_off0000ea80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA80 4712 bytes
SHA-256: 21e0dce259b29431fbf11cbb0e34e928903e1163b27353bb97fb497960e2b322
font_01_sfnt_off0000fa9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9E 9576 bytes
SHA-256: 2f921117f2814460dadb4f85c1fbf3ab6234c454478c56ec6a3ab51a26e514e6

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