Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f9096c7772e5321…

MALICIOUS

PDF

67.4 KB Created: 2021-01-11 10:02:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 482615e16ad37d243b0e48eb19535afd SHA-1: 5c52127563c8f28d6e229ac5b2620c4355720602 SHA-256: 2f9096c7772e5321834f90074ee25585ff0351bdc18ae026b9187d5cc2af9410
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to various PDF files hosted on external sites, indicating a link farm or redirection strategy. One critical heuristic identified a link to known malicious redirector infrastructure, and another flagged the PDF as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

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://traffmen.ru/aws?utm_term=amedspor+forma+fiyatlar%25C4%25B1 In PDF document text
    • https://zexajupa.weebly.com/uploads/1/3/4/6/134692079/7350769.pdfIn PDF document text
    • https://jezitazosebizag.weebly.com/uploads/1/3/4/7/134700096/xutef_dikak_kobinakafowumi_tivaguxulep.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416150/normal_5ff459c039dc3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409796/normal_5f9fb941a93e3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386330/normal_5fc3cdc982878.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369318/normal_5f8f323c7d757.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369776/normal_5ff1849f8e4aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375194/normal_5f9dce5f33e93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424689/normal_5fbd5aff3ace5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/mogedozara/nowosabasulanobatemexini.pdfIn PDF document text
    • https://s3.amazonaws.com/wukara/building_a_logistic_regression_model_from_scratch.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bcf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCF7 4992 bytes
SHA-256: fc8da858069b5b7134cf031c0ed8550009c6244d42cabfca84a2a78ea728c923
font_01_sfnt_off0000cdf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF8 11156 bytes
SHA-256: cfedd69315924a82e2174941a37f86053dd7ba0cfc7e4e34c17279b83030c968
font_02_sfnt_off0000f11d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11D 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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