Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec957aedb194decf…

MALICIOUS

PDF

71.1 KB Created: 2021-09-16 06:49:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3328b8027a96f9aca1ca97f834eda155 SHA-1: 5ecbb632167625d0d706999eeecf0b0d8ab04a3d SHA-256: ec957aedb194decfc816d438127b3c9ebfce8e0bbd152c9e5e46d0e24cae92b9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous URLs, many pointing to unknown PDF files, suggest a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://abwingsde.com/uploads/files/rududefedodumave.pdf In PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/161308fd2b7d75---pewidagigad.pdfIn PDF document text
    • http://neapol-m.ru/usr/file/66931030130.pdfIn PDF document text
    • https://panoramamall.bg/ckeditor/ckfinder/userfiles/files/bifafulebanezaxele.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/46990060554.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/midavumizeronemujalefik.pdfIn PDF document text
    • http://abpjseah.news-read.com/upload/files/gikekoje.pdfIn PDF document text
    • http://104408017.linker.tw/files/6874348249.pdfIn PDF document text
    • https://sinarlangit1.com/contents/files/xolisutubezini.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/diwudizebepujiv.pdfIn PDF document text
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/sejiganizidevavefuduxus.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/19320476056.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/voxamivis.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/wetaxepegipepunuguwo.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210910050402.pdfIn PDF document text
    • http://519pf.com/userfiles/files/88975791439.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352ea3ca898---49108327191.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/1696518605.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/jedofizopepigotafakulefu.pdfIn PDF document text
    • http://police8coop.com/UserFiles/file/19961229062.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/87400143877.pdfIn PDF document text
    • http://coumert.com/images/file/xubiposase.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210904_E4D59EFEE6F8EE2B.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=need+for+speed+most+wanted+game+download+for+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_off0000b6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6C4 15152 bytes
SHA-256: 688de31f5410d65f4c86c738c5d51eb2ad79c51659dcc6032e52cfb7f2321ce9
font_01_sfnt_off0000dd35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD35 10904 bytes
SHA-256: 2154ce42b42d5325d97ffd9a4d3778224bf6d2c1acf5d8f208bec6d919ab2547
font_02_sfnt_off0000f64c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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