Malicious PDF — malware analysis report

Static analysis result for SHA-256 75f4b7cf0cf72af9…

MALICIOUS

PDF

72.8 KB Created: 2020-11-13 12:04:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 21998da7b5edfdaffe147c414a0fe216 SHA-1: e79b287bc4fb01eb93d6588b2b0d5549b263ccf0 SHA-256: 75f4b7cf0cf72af91bcc708f67826e50f02ce3440e217ce76b22d52406b750f4
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on link farm domains, and one is identified as a malicious redirector. The heuristic firings indicate the PDF is designed to redirect users to malicious infrastructure, likely for phishing or malware delivery. While no scripts were explicitly extracted, the nature of the links and the ML classification suggest exploitation of PDF vulnerabilities to execute malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://traffking.ru/123?utm_term=xiv.+greek+and+roman+gods+in+review+crossword+puzzle+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4426957/normal_5f9a3aeb75908.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375210/normal_5f8cbf24a12fc.pdfIn PDF document text
    • https://naxupezo.weebly.com/uploads/1/3/4/3/134350891/tazuz-susebujawemal.pdfIn PDF document text
    • https://pisanofinupu.weebly.com/uploads/1/3/1/4/131437881/5945915.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383322/normal_5f9df69eb9985.pdfIn PDF document text
    • https://vopevejefed.weebly.com/uploads/1/3/1/6/131606133/5493933.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470975/normal_5fad408d6d0b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365536/normal_5f88732ecf652.pdfIn PDF document text
    • https://tisemadu.weebly.com/uploads/1/3/4/3/134387657/gubepuxik-mibufevatewi.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/35034c9a-1760-4606-bc19-4a5fd9b57e08/rock_and_mineral_field_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f9966a5-68ab-4a68-8131-f131b23f8cc3/brinks_type_44_1011_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6759cb27-498d-4b57-a9dc-efdce4453bb7/42139340715.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14630e4e-cfde-4699-9921-47ba0aefc817/witcher_3_gesnge_eines_ritterherzens.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f32283a-eb90-420e-8ba9-358b23b8d534/revista_h_junio_2018_descargar.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_off0000e01e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01E 5668 bytes
SHA-256: 2d84eed7c420be9e9268ee7c4e749546137dcab508d9044e876e79f4f49d8119
font_01_sfnt_off0000f37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37A 10012 bytes
SHA-256: a0e844af10480bc1b8e7936bf31d7fc34d5912241754d09650a1b193ed95dad8

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