Malicious PDF — malware analysis report

Static analysis result for SHA-256 97f460cbd7f0faa1…

MALICIOUS

PDF

77.2 KB Created: 2021-09-18 11:38:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f683475dd6e5a411ce15e4009fb420d8 SHA-1: 217c28c774fe4f3799e6b05013f306c8e953d38a SHA-256: 97f460cbd7f0faa1818e84e5bddcd32664c9e2e60b2ea37ed9dee6182cd6af6d
134 Risk Score

Malware Insights

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

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://inwebjor.ru/uplcv?utm_term=mortal+kombat+1+arcade+apk PDF link annotation
    • http://immodraft.de/images/architekten_agentur_images_/file/pofaridixamusoxokud.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/fosokaxoximajalogoravidez.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/niveruxubinatuxusobo.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/4ef438895dfa183f13668c2839280377/90339448540.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/72833795434.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/bomesudezolewikujawikeja.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/wesijive.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/66024221051.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/fomisikofebexuka.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/gezapajevibotosik.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/161323b0fa9fc9---dikusidipaveziduburar.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/45549534691.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/43163823592.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/gorigibalasibilezo.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/funixulutix.pdfIn PDF document text
    • http://domuran.pl/files/file/poxegoxe.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/ralizizusid.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/xulezofi.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/77708774491.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/volifakawejinenusujesas.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/demoroforojeredo.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/lamigonabejufalu.pdfIn PDF document text
    • http://peak-experience-europe.com/images/blog/file/64600189086.pdfIn PDF document text
    • http://jedwines.com/cmsCart/upload/file/nikikini.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/8038290342.pdfIn PDF document text
    • http://radiosalsa.fr/php/rs/filesupload/file/72923786140.pdfIn PDF document text
    • 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_off0000ca2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE241 10588 bytes
SHA-256: 933907f47d30b2c44be1695e8a37975726d8196889ddee4533dfb0710d84618c
font_02_sfnt_off0000fa56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA56 17400 bytes
SHA-256: 169e7731f5208bdf33eb449651c0ab99517743c9c5315cf75a864d766c86e170