Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4e646dbcfd860af…

MALICIOUS

PDF

76.8 KB Created: 2021-09-12 22:07:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 06ef6fe6fa9e945132da6d7863277aad SHA-1: 4fc015958f2702a523eacc5203ebf1ee638d8719 SHA-256: a4e646dbcfd860afb7367f01bd3906e2fb89477885b63bf68d8a856b20d9d86d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains 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 phishing or malware distribution. The presence of embedded URLs suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 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.
  • 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://krisoc.ru/uplcv?utm_term=add+text+to+photo+android PDF link annotation
    • http://maimungkorn.com/UserFiles/file/vanuregod.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/fadagalovaj.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/2155763975.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/18569989128.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/56564631338.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/6822da7043817e6114d5224eff4bae33/luvisilawesofegutozowa.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/kegolifoj.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/fidetitile.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/wawebipigabaje.pdfIn PDF document text
    • http://membranekeyboard.pl/_data/file/larapozeluburupusejozo.pdfIn PDF document text
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/20621467216.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/27885189942.pdfIn PDF document text
    • http://qdxqw.com/uploadfile/file/vomowojenu.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133be6747844---18542100651.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/juzasimoter.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/70864390837.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/robarite.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/padidebeni.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/49580671026.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/61347148247.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/fuxado.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0D 16664 bytes
SHA-256: 171fefc9d395451558a861bea5a142819b5b7fe35aa787089bb30644880a258b
font_01_sfnt_off0000f6ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F04 10360 bytes
SHA-256: 696403642072ffb20ea222ae556ecfd840dd9e05dadecfb46cbc89ffa9c6d18b

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