Malicious PDF — malware analysis report

Static analysis result for SHA-256 afe14e69a397e740…

MALICIOUS

PDF

76.8 KB Created: 2021-09-13 04:56:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8e95c058b3c9b3894a50170c5620560a SHA-1: 8a0f624f35e10364136eaa176f08ae60817ad2fb SHA-256: afe14e69a397e740547289ba98aa4d1d9c1fd936ba107f2c9744c4f7cbf899cf
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://amoslodge10-org.alljobsinliberia.com/ckfinder/userfiles/files/zezoz.pdf In PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/84771128742.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/75763330750.pdfIn PDF document text
    • https://valgott.com/images/userfiles/file/weraretijuxa.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/78969158299.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/30526206861.pdfIn PDF document text
    • https://viettrungson.com/media/Files/79107806080.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/zivuradunoxawunivanofan.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/xasasazefukoseviromugo.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/87355516004.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/vojaparuvapumedezut.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/sofogajuji.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/80754486929.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/26396979981.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/40313912814.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/potugexubiw.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210910_5614DD83356B6478.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/moranisulubolorixunesug.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138e274c91b2---makokowiv.pdfIn PDF document text
    • http://we-women.de/default/files/uploads/file/bonapidu.pdfIn PDF document text
    • https://megashina24.ru/files/files/27289151152.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/50141898313.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=acknowledgement+for+offer+letter+acceptancePDF 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_off0000c728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC728 10864 bytes
SHA-256: a47a41e3e84686b2f4d598e24bdc437accb39fe24d08ad23f90a422bb9adcf64
font_01_sfnt_off0000e020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE020 17496 bytes
SHA-256: f34a520e62be67892d38ca5136ecb43ecc6838a63894cdf019e4ee8b8ee1365a
font_02_sfnt_off00010da6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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