Malicious PDF — malware analysis report

Static analysis result for SHA-256 39c9c1a8d7c00d24…

MALICIOUS

PDF

69.6 KB Created: 2021-09-19 18:12:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 77d365819518815e416897a1db5bff16 SHA-1: 066f163e30f099c299e85ebe49fae2811931d85e SHA-256: 39c9c1a8d7c00d24ed095364ea807425cef3e28096e02af9baf70c20de9fedae
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also exhibits characteristics of a link farm, with numerous external URIs pointing to various domains, suggesting an attempt to obscure the final destination or distribute payloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://chiengthai.com/file_media/file_image/file/96463136595.pdf In PDF document text
    • http://star-transform-moscow.ru/uimg/files/nimowowo.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/64400778410.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/jekulutiro.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/labejiburu.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/dibuxijebazedodozomisep.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/21324204874.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/a2pq56ev7cqvi26cubqumtrfn7/gasodipuxunorobuvonezedul.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/zojiludavowixewedipobo.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/xafivatejilasufulutipawud.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/13163534527.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/tezofebogedaponoxagi.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/wixubevejonifudufetazeb.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1631514547.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/38519397495.pdfIn PDF document text
    • https://pensionradvanice.cz/res/file/9964520147.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/46916726406.pdfIn PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/juvugimudepat.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/83778114488.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613135656c5ff---18250102165.pdfIn PDF document text
    • https://isosklo.cz/uploads/71120632630.pdfIn PDF document text
    • https://restaurant-kamkok.fr/img/Data/file/59896112814.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/82652913317.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=drone+shadow+strike+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_off0000b1b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B8 10624 bytes
SHA-256: 33056129092b7f0c40477f9d1d043bbe0f8edb8dc7e89bafab98830b3ab7502c
font_01_sfnt_off0000ca08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21A 15352 bytes
SHA-256: 39e80842d146fdf1f2ede67d4897e050630a71234211ecd6287b4d09b2bba6cb