Malicious PDF — malware analysis report

Static analysis result for SHA-256 2870e3f0e09ea84f…

MALICIOUS

PDF

75.0 KB Created: 2021-03-27 19:39:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6e8059ca2eba0b61e7e086b62cc9961 SHA-1: d077657d0199aeb86a26aa687e3ecae798596560 SHA-256: 2870e3f0e09ea84f819d0c107ba9335a01c6a36bad4b2696df88ead1cce080d3
96 Risk Score

Malware Insights

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

The PDF contains heuristics indicating an external URI and is flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The embedded URL, 'https://ponafet.ru/123?utm_term=android+sdk+manager+install+cmake', is likely used to deliver a secondary payload or redirect the user to a phishing site. The document body, though heavily obfuscated, contains strings related to Android SDK manager and cmake, suggesting a lure related to software development tools.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/123?utm_term=android+sdk+manager+install+cmake
    • https://cdn-cms.f-static.net/uploads/4494874/normal_604f8b9ce4661.pdf
    • https://dexatasudawuge.weebly.com/uploads/1/3/4/4/134477966/2286f4f71.pdf
    • http://kieverts.xyz/cutting_skills_worksheets_for_preschoolersl4q66.pdf
    • http://top-salez.site/25522401058z0pvs.pdf
    • https://dubanivexog.weebly.com/uploads/1/3/4/3/134331992/fujokiro.pdf
    • https://sorawujij.weebly.com/uploads/1/3/4/6/134671526/raloxoluzaxufajesifa.pdf
    • https://cdn-cms.f-static.net/uploads/4477910/normal_5fe7c7594c978.pdf
    • http://tixesikixux.mygamesonline.org/los_mejores_amplificadores_de_audio_para_casa.pdf
    • http://anbieterbewertung-autoscoutch.com/bulletin_de_salaire_suisser4l05.pdf
    • http://prizinsta24.site/vazunadinr0sq.pdf
    • https://static.s123-cdn-static.com/uploads/4449184/normal_5fd05acca84d4.pdf
    • http://ses-sanobrabotka.ru/jitezn3ffj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ca30e0e0-ecf2-44ab-b6a2-fe26291458be.filesusr.com/ugd/34e21e_b887b1142139412893bc38f4e1c5a421.pdf?index=true
    • http://xedemigu.atwebpages.com/livro_acgih_2020_portugues.pdf
    • https://f904ef53-caa1-4f0f-8a97-c50675c03ece.filesusr.com/ugd/2f8cea_939cd5d8eaf448d39e21fb63a65cacd5.pdf?index=true
    • https://694dae7a-2033-4a59-8b06-91ff4eec0774.filesusr.com/ugd/e1d58f_7b5e0c462c794128b973e704b3ff0bd5.pdf?index=true
    • https://1d942ef5-affb-47d8-8f99-70a3d187b733.filesusr.com/ugd/3283b0_d757dc05c4c044d393fca1d5b27b4c11.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8c4.bin
6f3b50b57392608dcd1719ebb1690c54df71d0f6bb325a909b4ab2547eaef1bc
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C4 5312 bytes
font_01_sfnt_off0000fac1.bin
e4de73be89da7f95d523e00bf7cd14d9ca288490067f6a995f891beac8bba640
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC1 10776 bytes