Malicious PDF — malware analysis report

Static analysis result for SHA-256 94049b41f720975c…

MALICIOUS

PDF

83.2 KB Created: 2021-03-06 22:25:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 9bd089336f3a3ac1674ab2baeb85db34 SHA-1: ec1d3246bf0a73ff2f10d1dca52360682c67c25e SHA-256: 94049b41f720975c6d20d855c6a4043e17bbd05d34230e0ba207acd496166ada
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, directing users to various PDF documents. One prominent URL, 'https://leonvi.ru/wix?keyword=growth+and+decay+worksheet+doc', suggests a lure to disguise the malicious intent. The ML classifier and ClamAV detection strongly indicate malicious activity, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/wix?keyword=growth+and+decay+worksheet+doc PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369173/normal_6038c626dbe7c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447631/normal_5ff4d4b22487e.pdfIn PDF document text
    • https://cdn.sqhk.co/xibetevoxaj/igO4Gfj/51118074224.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382972/normal_5fc6900099595.pdfIn PDF document text
    • https://cdn.sqhk.co/velabolo/jHnvkhc/97017314563.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411944/normal_5fcb397d48451.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404313/normal_5fe2c1a03c4d4.pdfIn PDF document text
    • http://santecmb-sarl.com/master_excel_sheet_by_nsepayw1zvf.pdfIn PDF document text
    • http://sbrf.link/how_much_does_a_project_management_professional_makeg99qk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451374/normal_600b2d2e085f4.pdfIn PDF document text
    • http://magicwoolshop.com/xifotetesugoledile7ea5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444356/normal_601061ecd93c2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445864/normal_5ff7f5cdd7fff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369494/normal_601c7d92dcecb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379961/normal_602eab2e917ea.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/kukazowox/5051627991.pdfIn PDF document text
    • https://db6d201d-bdff-4648-9982-d9cfaac7639e.filesusr.com/ugd/98857b_b0c007f80d2c4f32b7f9fc217dae8c53.pdf?index=trueIn PDF document text
    • https://bf6af823-cb0d-4ee8-9d5b-4f0b1de5ed24.filesusr.com/ugd/9eb187_b85ac60ab30443e3872dd9319fe21774.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zonivezada/meligixez.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/adobe_writer_free_trial.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00011426.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11426 23216 bytes
SHA-256: 3f78897e7e31acb1ac1e9265a0f0ec5b19e6ee1b8811d14a641fc9ab6fcd8fb0
font_00_sfnt_off0000deeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEB 5284 bytes
SHA-256: ecd1d8e7e9b4fd5ec9c62d306f5a9f5ae6f09f0d59bec28a9c45f1e2bc676705
font_01_sfnt_off0000f0f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F5 10184 bytes
SHA-256: 06b7ccabcb2306ad357901a7f83b8d666cfd5ec49a386348ceb7d59d5f4ec9ba

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