Malicious PDF — malware analysis report

Static analysis result for SHA-256 40baf3b45b19910c…

MALICIOUS

PDF

80.4 KB Created: 2021-09-22 23:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dbed5126f887fdc5375c5c8216222ec1 SHA-1: c6376f11a2136d71a037ad83dc336b61e3ae06fe SHA-256: 40baf3b45b19910cbb659e64e7217ef7b0fba721769bc0a59c07833c7916bef5
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. Multiple external links are present, some pointing to potentially untrusted domains, suggesting an attempt to redirect users to malicious content or phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://vouchertiket.com/airplane/ckeditor/uploads/files/71166664791.pdf In PDF document text
    • http://thamdinhgiadaiquang.com/img/files/nejizurigisoragovi.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/29738909444.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/movamopelokuja.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/82005825783.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/kiwedo.pdfIn PDF document text
    • http://sromedical.com/file_media/file_image/file/57916933309.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/82633551766.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/61298931365.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16133a88f8a8fe---nekumupo.pdfIn PDF document text
    • http://lg-palette.com/upload/files/36119082129.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/wexigupelebi.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/xunigapunumadivonamu.pdfIn PDF document text
    • http://afslab.asia/upload/files/94803408029.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/xigiwewegomagegasofukokuf.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/19449525116.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/43246865045.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/21427957545.pdfIn PDF document text
    • https://sapporopools.com/contents/files/87843260760.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/jududegexipur.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/jobiso.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/f2c74b686cfc416fb17e2d39577bdccd/35390072332.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/vuxadusakawubinub.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210906194820_1385679015.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=usb+tethering+windows+10+iphonePDF 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_off0000d0d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E5 19396 bytes
SHA-256: a28ff850b7a47c1be62855dc6fc3e49b47db3f36e6bc5fd8cb4f438f03c36989
font_02_sfnt_off00011b3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3D 10872 bytes
SHA-256: 89b14993280c48878f00f9a5715c3a5db3969b3cc673d09139db540eb6d738b0