Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff49a3bba9b532ca…

MALICIOUS

PDF

82.5 KB Created: 2021-09-22 12:47:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e212a0b2e1d720a8dffd0c0c4ff5ad16 SHA-1: e6ee03e0920f89000892ce513b4858039b6e7da5 SHA-256: ff49a3bba9b532cac5e32ffeade96122d0beeabdc6ca04f8b151729cb6ceaf7c
134 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also contains numerous external URIs, many of which point to suspicious domains and are likely used to host malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/jopesesufinoze.pdf In PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/5695416921.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/nedol.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/28794065549.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/6d1e86e21c40137079527cfa996f3a46/lufafetifisusaduderobim.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/51260379534.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/bitekefazakobugufufov.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/49630540596.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-5/20210905102706742664.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/fipevalijuxaz.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/soramerizeru.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/madipore.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/piwefopedu.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/47177186884.pdfIn PDF document text
    • http://fructusartis.com/i/File/83120584394.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/dipakilafivudopexorut.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/65090957135.pdfIn PDF document text
    • http://xn--80aer5aza.xn----htbdepbihnfb8cyg.xn--p1ai/ckfinder/userfiles/files/63731923984.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/mivonaw.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/sesevebe.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/vewar.pdfIn PDF document text
    • http://tochalco.com/uploads/files/padorukupelap.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/19326362883.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/xegatidudu.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/79203899252.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16142ea6a7da70---sumadepeku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=pokemon+platinum+all+cheatsPDF 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_off0000ddf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f60d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60D 10732 bytes
SHA-256: 89cb3a5665624a780774e07bf6e2138f0fce36d7950c5c75d5487ea38511c51d
font_02_sfnt_off00010e86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E86 17676 bytes
SHA-256: 9711afbdba3742c878c702ab2961280d0648fcd8a0e52a13d655cadaa46c7d0a