Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a6131750ae3addb…

MALICIOUS

PDF

84.2 KB Created: 2021-09-16 12:18:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 671e91519466e9299e5bbb348699074c SHA-1: 08120ac036a95bc0ab7212076da1108a235a161c SHA-256: 6a6131750ae3addb5aa138cf0a579604d5e90eb91ccbc051f50810ddb43371db
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a large number of external URIs, many hosted on disposable domains, indicating a link farm likely used to obscure the ultimate destination or to host phishing lures. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://thesecurityguardunion.ca/userfiles/files/lilanazitodirewi.pdf In PDF document text
    • http://studiobardinisrl.com/userfiles/files/28930565763.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/vasosojobatogekofobin.pdfIn PDF document text
    • http://baovecongtruong.com/upload/files/gonezazajubefexadalaleja.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131cd452caef---papejixor.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/65707982235.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/naseliketapusirede.pdfIn PDF document text
    • http://handgun.ee/media/file/zifojonolipupa.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/jiwerofofinefadukovazo.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/22989285873.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/79009988513.pdfIn PDF document text
    • https://drishtinetcom.in/FCKeditor/file/31287914547.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/18873553410.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/liwuvipakuvamezonoja.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/b0c862032238263f5a1ff049198c9c0c/purexasadoru.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/2529986798.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/siwoluxuk.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/tudinowori.pdfIn PDF document text
    • http://yuh-tarng.com/userfiles/file/15836919370.pdfIn PDF document text
    • http://hanaelectric.com/userData/board/file/27828098537.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/nurufovodusajezifi.pdfIn PDF document text
    • https://ekinyalitim.com/depo/sayfaresim/file/nesesakuxa.pdfIn PDF document text
    • http://yjbiotech.cn/upload/files/60039830011.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/81304810968.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/86067807393.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=strong+acid+characteristicsPDF 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_off0000e581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE581 17692 bytes
SHA-256: ef1a0dad23e69306c65cf2a678e0eb566bada70a4af60b0745dfdedfca2ceb8e
font_01_sfnt_off00011344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11344 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B5B 10676 bytes
SHA-256: f2a4e52210c8b87b7fbd7c14e0dc6e13b53700e4ed540ae782b0341f37fe78c0