Malicious PDF — malware analysis report

Static analysis result for SHA-256 a589e4bb3ae02350…

MALICIOUS

PDF

70.3 KB Created: 2021-09-11 05:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 111cd018aa9ad8cd20a377c87a48a0e4 SHA-1: 47a9220a17b0ca9626d8808e9b8753c1011487cc SHA-256: a589e4bb3ae023507c8245825c7609edb5efd8dc5300f518765facfa531a5208
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

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 http://potlista.com/file/files/zavukatij.pdf In PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/jisuwum.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16135c03abeddb---23246985323.pdfIn PDF document text
    • https://mayphoviet.com/media/ftp/file/saguwijeb.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/baluxizix.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/47563031154.pdfIn PDF document text
    • https://fuze-pay.com/ckfinder/userfiles/files/75091574835.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/26087417736.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/fupozopunobelibikekax.pdfIn PDF document text
    • https://km2804.com/ckupload/files/80841744840.pdfIn PDF document text
    • https://destockbaby.com/ckfinder/userfiles/files/fowob.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/73780855505.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/29020542298.pdfIn PDF document text
    • https://kawanmto.com/contents/files/92394794481.pdfIn PDF document text
    • https://tessuno.com/upload/files/6132389dcbe02.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/betobofaki.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/14387216698.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/sufakomigulo.pdfIn PDF document text
    • http://hidropro.hu/upload/37522950453.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/22545857619.pdfIn PDF document text
    • https://xn--atpta-nfb.lv/images/userfiles/files/ranelosometexu.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16134d083b1cfb---14402055983.pdfIn PDF document text
    • http://texmet.pl/userimages/file/42842750879.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/13093619967.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=7+deadly+sins+grand+cross+jp+apkPDF 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_off0000b3e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E6 10880 bytes
SHA-256: dcb2f0457511004fdb2b8bec9715ffe1c036a3bcd20448e00fb686fdec20f226
font_01_sfnt_off0000cce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE9 15436 bytes
SHA-256: 5e04c1f825a19455857bb50c713c668e51c49d2f85ce6b73c6461d3d75cb0455
font_02_sfnt_off0000f3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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