Malicious PDF — malware analysis report

Static analysis result for SHA-256 8804a1f06190dcba…

MALICIOUS

PDF

81.4 KB Created: 2021-09-22 19:35:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8c44f9cecae6e859cf7dc6490d8580d2 SHA-1: 43c0ca27cd1c39b1194e3da91ca51f3d8d7bf2b5 SHA-256: 8804a1f06190dcba0c73cf698d8e19ad75dd13e3048d2e93f8dc03ea76f55ac1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript, indicating an attempt to execute code within the PDF viewer. The PDF also acts as a link farm, directing users to numerous external URLs, many of which are likely part of a phishing or malware distribution scheme. The presence of embedded JavaScript suggests an attack pattern involving client-side exploitation or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9a5662090---62125756217.pdf In PDF document text
    • http://myphamhelios.vn/luutru/files/52114046466.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/13473847402.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/javozi.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614161c3d8d80---nepivenaririkutizilidir.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/valomupawiragagonatavedan.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/53263200899.pdfIn PDF document text
    • http://oiseau-bleu-morzine.com/userfiles/file/87854550365.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/55929363634.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/63511660016.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/jofamosoxamopobinod.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/wiwuwonuj.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/gijizanelutowadafizilok.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16141c6e741804---gidijulox.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/86473704502.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/zewuvadamova.pdfIn PDF document text
    • http://www.vnv.nu/admin/library/ckfinder/userfiles/files/digek.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/wazowutitelodotofexiwitaj.pdfIn PDF document text
    • http://househouse.it/userfiles/files/15886274245.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/21090614125980879676g9gm.pdfIn PDF document text
    • http://aurora-c.jp/files/files/zabevexufamotitubo.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/xenojepet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=dungeon+boss+mod+apkPDF 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_off0000d843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD843 18176 bytes
SHA-256: 0086f59290bdc298abbe0fc96c8b6cef11d2df0e58aad3173a3c484d4bcb4c41
font_01_sfnt_off000107b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC9 10732 bytes
SHA-256: 7c99a3b37bf24e1e10f71cea9c96353f01580d5039a56b1f8c35d091427be90e