Malicious PDF — malware analysis report

Static analysis result for SHA-256 c481e72d3e49b3fb…

MALICIOUS

PDF

79.8 KB Created: 2021-09-11 20:23:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 607b85581b6ce49672ee257ec882a5c2 SHA-1: e0b0a4c3381794d7462c2dc280aac5186e1abf94 SHA-256: c481e72d3e49b3fb9005222925d411a4976a6e97764d247c9fa624b34a3c33c1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to domains with suspicious naming conventions and associated with link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The document body is heavily obfuscated, suggesting an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://oniceh.ru/uplcv?utm_term=app+cloner+premium+hack+apk
    • https://ritascreation.com/userfiles/file/60871444069.pdf
    • https://centrumschoolka.pl/photos/file/raxofositaj.pdf
    • http://chinahongji.com/d/files/37075380832.pdf
    • https://lecormier-menuiserie.com/www/upload/files/92412015338.pdf
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/24636687778.pdf
    • http://ros-audit.com/i/up/file/73956705451.pdf
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/baxenuzona.pdf
    • https://encoyun.com/calisma2/files/uploads/mixuruxapuxabodidexuf.pdf
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/bobevetepesopepar.pdf
    • http://nuestratierrapremios.com/campannas/file/10145615463.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161303f192aabb---dapozazuwutugefukibadimo.pdf
    • http://rwdwebwebdesign.com/img-aim/files/wisuwunusexudux.pdf
    • http://hkxhjfc.ltd/uploads/files/20210909102501.pdf
    • https://bednidhitraders.com/userfiles/file/1298980878.pdf
    • http://96rangjai.com/userfiles/file/60833592980.pdf
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/mufonoliwumitarewudema.pdf
    • http://cuathepvangohaiduong.com/images/ckeditor/files/lekesomiderizuvixerisefa.pdf
    • http://angelcabrera.com/FCKfiles/file/83037298516.pdf
    • http://heorungminhphat.com/luutru/files/keruzifukorez.pdf
    • https://kingbakerypans.com/userfiles/file/60106540978.pdf
    • http://phonphangschool.com/upload/files/91196174977.pdf
    • https://hinodecoder.com/userfiles/file/dugisowogepenegagera.pdf
    • https://grandiosieventinuziali.it/filesUploads/file/10188026321.pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4d8.bin
c52cebe0688d45613cf26fea71b7723fc6341b46fdc719bd1830e969dd3c52d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D8 17584 bytes
font_01_sfnt_off00010265.bin
9f76d3f9068c1a815eb553a48edc6beb6ea448a33fc5e05fb8b7450cc85e5aa7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10265 10548 bytes
font_02_sfnt_off00011a32.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A32 16792 bytes

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