Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecaa173550210adf…

MALICIOUS

PDF

74.3 KB Created: 2021-09-26 22:14:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 93bb01cd8391c8772698ab1cefb2860f SHA-1: 3e3d7f0aca2dfa4aa9378d9a650f0fd428de0853 SHA-256: ecaa173550210adf412c70a07d9aca6dbd7f0201fd454a206fc92e3dced96e9d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to potentially disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://koreadramatour.com/FileData/ckfinder/files/20210915_43A477BBFDB0A352.pdf In PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/85721757245.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/40653889988.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/mep04gao28ljj374e8ca79tr4k/pakosujuzozudase.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/52579218843.pdfIn PDF document text
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/78814927845.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/89904284858.pdfIn PDF document text
    • http://sinners-party.de/media/file/85133098680.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/74507317004.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/56318670782.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/kixojolesiwewovu.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/90099893318.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/pumawajogefin.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/51908245857.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/novitofimogezapofimowume.pdfIn PDF document text
    • https://ccvt.vinaonegroup.net/upload/files/8527190311.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/55313957066.pdfIn PDF document text
    • http://pololanna.com/user_img/files/40580027929.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/91291528993.pdfIn PDF document text
    • http://irths.com/upload_files/files/sosur.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/60309030517.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/10608777153.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/zibimiridunoxibumisosoze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=whatsapp+for+pc+free+download+windows+7+ultimate+32+bitPDF link annotation
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD014 11548 bytes
SHA-256: 3caea94c68371ffd037af4a05df8fbc7b7275fe20b2b12cf06194e66263e8a2e
font_02_sfnt_off0000eb34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB34 18696 bytes
SHA-256: 50d68c14643af0ea6cfd01d882c4b7b8dfc0f7b6d2bfc0d3253297e7d9039f34

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