Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d1eeb9638187abc…

MALICIOUS

PDF

79.7 KB Created: 2021-03-18 11:11:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 36ad8e8057425d66c7ce08dcd91e30e4 SHA-1: 8576f242e16862d4b79f509128b3f8cc43aa01e8 SHA-256: 9d1eeb9638187abc45c5de90e2effb3a38696d1b6867e9752602ec05f0a6c70c
156 Risk Score

Malware Insights

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

The PDF file contains a link farm designed to mimic search results, specifically for 'Telugu biodata format for marriage pdf free download'. This tactic is used to trick users into downloading further malicious PDF files from external URLs. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

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://gimoguvi.ru/award?keyword=telugu+biodata+format+for+marriage+pdf+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384296/normal_6036cfd7bf13e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385424/normal_603a0840bb492.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452587/normal_60052d686891d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373999/normal_603cab10d1a11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410201/normal_600b9c8561516.pdfIn PDF document text
    • https://mufamemibota.weebly.com/uploads/1/3/1/8/131856380/katunu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368781/normal_603c149b94cfe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485166/normal_603200f808f06.pdfIn PDF document text
    • https://kukanoli.weebly.com/uploads/1/3/4/6/134641169/zefuzopefavora-wowagenirusa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369520/normal_6017b12c0e345.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452588/normal_6023f0d2974e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443824/normal_600f079e7f1cb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368781/normal_5ff1f43fe49bc.pdfIn PDF document text
    • https://gimelasu.weebly.com/uploads/1/3/4/5/134513778/266361.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370528/normal_5fe39cef22642.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494677/normal_5ffeba89314a4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/kindle_cloud_reader_ed_books_location.pdfIn PDF document text
    • https://s3.amazonaws.com/jejulurowev/audi_car_symbol_images.pdfIn PDF document text
    • https://s3.amazonaws.com/kisagoz/kezelugedim.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_off0000f9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D5 5364 bytes
SHA-256: 103e5a8fcc5b5f3432c295366b4033573d1eb9182b139644ad6380c653fa3405
font_01_sfnt_off00010c11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C11 11004 bytes
SHA-256: 2d72616431db1f73761ce13a9c68ac3574941aa01680a8c3c0b08d6458ca1c8f

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