Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d5341af3f3ca778…

MALICIOUS

PDF

70.0 KB Created: 2021-09-27 04:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 93b17ed09413c644846aff9baf8db591 SHA-1: f16b8f1f4146767d375d9ee77bc22113b5bfc3ad SHA-256: 3d5341af3f3ca778779f82eb40fbb09abb92e9246ab0e5467a6a98b8ad17ad81
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://festival-bg.com/media/ckuploads/files/lumesawatul.pdf In PDF document text
    • http://koddous.com/userfiles/file/20223302377.pdfIn PDF document text
    • https://luatkhangthai.vn/upload/fck/file/16539032383.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/nogitonudemu.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/viriwetodalib.pdfIn PDF document text
    • https://1snrpaulista.com.br/ckfinder/userfiles/files/veviwuzalajig.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/zadabajunusifimidupowedod.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/11320291789.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/65551067505.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/19543008676.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/83950303680.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/vebipulogebekopi.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/56938134925.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/kogewutamuvumexa.pdfIn PDF document text
    • http://aprt1day.ru/file/77784775279.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/17622052458.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/wupav.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/kutam.pdfIn PDF document text
    • http://newshop.jp/archive/file/xadaz.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/72326406011.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/43308901555.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/43695471734.pdfIn PDF document text
    • https://viktorina.ledoritulys.lt/files/jedolopadez.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/vabun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=noscript+for+android+chromePDF 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_off0000af51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF51 16704 bytes
SHA-256: 5dfa028680d775c83022135e59e77017f723fcdb7dbc3706c192ca7a613a596b
font_01_sfnt_off0000d9d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E9 10816 bytes
SHA-256: 4f698962bb9cfab94981ed60343c845ce0f6c421ca772158bf06ce5ec6b9b443

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