Malicious PDF — malware analysis report

Static analysis result for SHA-256 48db6d3407107c22…

MALICIOUS

PDF

85.5 KB Created: 2021-02-17 13:12:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 5fdd48290d77e40a505e88e0a37eefba SHA-1: 7e67810cb4d7e49ef9396feffb79c84102401b82 SHA-256: 48db6d3407107c224c75c0af2bfebf866254956d0e9f7a97fe8fb792abc2c2c4
96 Risk Score

Malware Insights

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

The PDF contains embedded URLs, with one pointing to a suspicious domain ('bologen.ru') that is likely part of a phishing or malware distribution scheme. ClamAV detection and ML classification strongly indicate malicious intent, classifying it as a phishing trojan. The document body, though heavily obfuscated, suggests an educational context, which is a common lure for phishing attacks.

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://bologen.ru/strik?utm_term=present+perfect+continuous+exercises+upper+intermediate PDF link annotation
    • http://wegansit.space/basic_category_theoryuk4kt.pdfIn PDF document text
    • http://rotixumuzu.22web.org/dialect_worksheet.pdfIn PDF document text
    • http://repair-kompov.ru/android_9._1_huawei_p10l9isk.pdfIn PDF document text
    • http://lodixol.22web.org/fetoxofajevidakiku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450719/normal_5ff149c5a3ba0.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/benubapopikaj/celtx_free_ubuntu.pdfIn PDF document text
    • https://s3.amazonaws.com/vavebufevodutob/wukawutodapilojapisi.pdfIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/rarano.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/70731571134.pdfIn PDF document text
    • http://radujexoxetapil.epizy.com/57391710068.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/semicolon_and_colon_quiz.pdfIn PDF document text
    • https://s3.amazonaws.com/vipinib/18764203479.pdfIn PDF document text
    • https://s3.amazonaws.com/setigafat/principles_of_aeroelasticity.pdfIn PDF document text
    • https://s3.amazonaws.com/latufenaw/cancer_de_prostata_en_mexico_2017.pdfIn PDF document text
    • http://jolatuziguxobe.rf.gd/buwisajufa.pdfIn PDF document text
    • https://s3.amazonaws.com/lolaritemukole/sobagaj.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/45570846710.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/bupoxazojonuxiwataxunu.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_off0001121d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121D 5336 bytes
SHA-256: 6b1f1b3e28d35f5bbdd419c8fa4cb7555f5004789279bae6614cf3a1c7c46458
font_01_sfnt_off00012435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12435 10648 bytes
SHA-256: 015f5460b8fb608052aee22c19f1a1ac2541f14f56778cfa7ac5aefefedf0348

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