Malicious PDF — malware analysis report

Static analysis result for SHA-256 eed9f2370ac57d5b…

MALICIOUS

PDF

78.1 KB Created: 2021-09-16 04:32:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 814414028b049251d78e723b9811a464 SHA-1: 8b4dd2b678faaceb44753b94d3833262155206ee SHA-256: eed9f2370ac57d5b16dc83774d2444ce87239302363c8a87ae969f7a81708edf
134 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is often used to redirect users to malicious sites or download further payloads. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is part of a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://haphadoor.com/upload/files/28695677591.pdf In PDF document text
    • https://avistravel.ro/userfiles/file/15171628238.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/20112174714.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/ssrv4l032gngukmrlh5t1sq2l6/waluja.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/57928564076.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/narotobamig.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/sujululeganiwovoneroje.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/sisiveruporikeni.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/55476362855.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/niboraxifoximo.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/wimidejawoxaxezifogazes.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/70509458301.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/32082737922.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/68241353279.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423c941e650---8775627101.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nowepudok.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/pimajatawasakewemano.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/95179861201.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210906235520.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/demaxojukedija.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/wuwuzajarexorakaf.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/75124681674.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/24364522080.pdfIn PDF document text
    • https://krusomying.com/data/file/2474822154.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16140ea4162b19---40922054206.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=react+android+iosPDF 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_off0000cd75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58C 10360 bytes
SHA-256: 51e58c1badd18c6b0740d72f3acf941e1c12bf047c2456f88438d338fcaf8ade
font_02_sfnt_off0000fd12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD12 17516 bytes
SHA-256: ebd1411e61f776b4a1ebbd97204f8fe79fb959266efd9e2a5281662bd195b385