Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba9375feebd8b0fa…

MALICIOUS

PDF

126.0 KB Created: 2020-11-18 02:21:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 239e8319571314c47dc499c45e9c411d SHA-1: ba07792145e99f6a3c129c65ac26134e6f6b9ed0 SHA-256: ba9375feebd8b0fa404d37a7ffe64515e4b98023813157b14bef486a771deede
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one identified as a malicious redirector. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and ML_NYX_PDF_MALICIOUS strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, but the presence of embedded URLs and the overall structure suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://gettraff.ru/aws?utm_term=introduction+to+paleontology+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4383132/normal_5f98406faf667.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381105/normal_5fa73990f186a.pdfIn PDF document text
    • https://nobinetezo.weebly.com/uploads/1/3/0/9/130969761/fapevawoluwojos_ribuz_kixoji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367004/normal_5f9b9a11ed94d.pdfIn PDF document text
    • https://fisizupesaxog.weebly.com/uploads/1/3/1/6/131636899/9118e12ac.pdfIn PDF document text
    • https://xumogimunosu.weebly.com/uploads/1/3/1/6/131607683/48afb0ac.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/9f9665c4-a5db-4c86-939a-0c0acdc2756e/philips_magnavox_universal_remote_control.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ffdc5cd-d75a-4ab2-a149-f9045637f11f/guilty_gear_dizzy_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7cae93e-e7f2-4cdc-af60-531cead474ca/51700691831.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bca519f-5891-4b4a-a71b-b6bcd6de3569/tigusajadutaf.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000197d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x197D7 5184 bytes
SHA-256: 9b0e4962b955ff98da958cfa1fb9f31b3770d4c42581e45846ca5fc3047bb862
font_01_sfnt_off0001a996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A996 12636 bytes
SHA-256: 81515a72b8871cfc9e4f92a251f0fc956d75c30de8b4ce8b6922f8f8a88fae6f
font_02_sfnt_off0001d38a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D38A 16552 bytes
SHA-256: 9df393d0e5081a9c995baf0eeec41e03b1ad249c4adc71a01701fcc6a16b2a72

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