Malicious PDF — malware analysis report

Static analysis result for SHA-256 d98be8cac57faa27…

MALICIOUS

PDF

83.6 KB Created: 2021-09-17 15:03:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2ba7b365f947c2b95534c485f2b02dfd SHA-1: 33e96f5b56a997484bfafe84e852644d4384c0a9 SHA-256: d98be8cac57faa2776347c613e9fc9077758cce153644cb7d4548097e29bacb7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on distinct domains, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 http://centroolosprato.it/userfiles/files/tufiko.pdf In PDF document text
    • http://sandlnae.com/data/editor/file/20814223742.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/11593703172.pdfIn PDF document text
    • http://gaytonfa.com/upload/files/18536533111.pdfIn PDF document text
    • https://glozor.com/userfiles/file/78575134530.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/87099675207.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16142081d6756e---gesoluwoxodonijona.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/talope.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/17203479506.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/64923522736.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/wamiwedasafowizimezor.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/79298380936.pdfIn PDF document text
    • https://radio-clipa.ro/userfiles/file/ravelopigewoso.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/puzubiduximesuwofamowar.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/36080088491.pdfIn PDF document text
    • http://jn-zhsc.com/upload/peniwiniduku.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/31269879709.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/m84e938tkf8hb3o5u93bh03td5/bevulibuwapu.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/zejaxuvexedizezefol.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/45606843062.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/razavewikabobejeledudo.pdfIn PDF document text
    • http://tainghe.vn/userfiles/file/6678434979.pdfIn PDF document text
    • http://deforma.it/userfiles/files/tokatumanikuvowimozugivit.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/vagugosujakojebaz.pdfIn PDF document text
    • https://pixel.bg/img/file/telajitefofuvawid.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/6429756661.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=video+editor+free+download+for+pc+without+watermarkPDF 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_off0000e01c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01C 10964 bytes
SHA-256: 740095b9132cff01f7b30ebed5fc4d054027666738d322350c7bee765640546f
font_01_sfnt_off0000f95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001116f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116F 18256 bytes
SHA-256: 7800a1867b25140674270239072e82082202f76f6c36ce7a3a12a9fef6e05432