Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b86972368fb2268…

MALICIOUS

PDF

79.2 KB Created: 2021-09-17 00:43:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 995939c9c737c44cbcacb6e4b2198c63 SHA-1: 4390d1ef865d35af20f95fc71f0b075701894791 SHA-256: 5b86972368fb226892360d5a1f62120b2f1b22ef4d17ae98166d1a924bfb3ba5
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, indicating an attempt to execute malicious code. The presence of numerous external URIs, many pointing to disposable domains and forming a link farm, strongly suggests a phishing or malware distribution campaign. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • 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://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/53028554446.pdf In PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/tobujuno.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/mewerubaginekesarexiluze.pdfIn PDF document text
    • https://brianspradlin.com/userfiles/file/43957983991.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/3303d0dae8f482afddc7c22a836bded9/67383278899.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/98935640809.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/90514240935.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/mejovetimanezumutalezaw.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/kobesodebuwopegonaku.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/75888825602.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/22815356530.pdfIn PDF document text
    • http://tuzy.pl/Upload/file/wedunewulodoloka.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/kemiwovinoje.pdfIn PDF document text
    • http://wine-paraphernalia.com/files/winep/_repo/file/44059450288.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/30611375714.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/mefasob.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210910233412.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/89605788672.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/53877977786.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/96754717688.pdfIn PDF document text
    • http://clevio.biz/fckUpload/file/gewigexuxevutuwibita.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/borifofewipelidapub.pdfIn PDF document text
    • http://thongthien.vn/upload/files/34168714422.pdfIn PDF document text
    • http://ibb-online.ru/f/file/28145719677.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/gizuwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=menghapus+iklan+di+chrome+androidPDF 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_off0000d1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B2 16788 bytes
SHA-256: ec0203771a3c257b23b0bbaaaad3060166d90e45d125f049e116a0e83401acd3
font_02_sfnt_off000115f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F5 11048 bytes
SHA-256: fbb28093f0891bfc649acbb59e280cdcde6f2732b4b8e72176d03e0b98aa76f0

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