Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ec2d4e51f8c63c…

MALICIOUS

PDF

72.8 KB Created: 2021-09-26 20:16:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d480bfbe792ab98abc0f91f95dbf7d12 SHA-1: 63898d59f89cf205f423402e43d99ec36c3528e0 SHA-256: 21ec2d4e51f8c63c6ee3c10c29bd35f00f1ae23f3aee2a3ea7be4264a9095c09
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 and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to facilitate phishing or malware distribution. The embedded JavaScript is a primary mechanism for executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://abhimaninteriors.com/ckfinder/userfiles/files/nelopozilezu.pdf In PDF document text
    • https://jung-yeunjang.ch/userfiles/file/34625035261.pdfIn PDF document text
    • http://cartopack.be/Images/file/95037458173.pdfIn PDF document text
    • https://tukangjp.com/contents/files/vavaxaxejowuromimuju.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/19697044265.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/tadipiba.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/xesiwomefeb.pdfIn PDF document text
    • http://skupka23.ru/upload/m/jalaxatuxozevurox.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/xikofefilutitaxibale.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/taziw.pdfIn PDF document text
    • https://gangnampools.com/contents/files/63254038862.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/47120864726.pdfIn PDF document text
    • https://istanajp.com/contents/files/57186584344.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/jodovudaj.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/kaxowudupig.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0c70a48d9---mijukulavofabirutabuzevox.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/tigokojumuripoxo.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/bufulorona.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/kolifotoruloka.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/65069281324.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/97595228905.pdfIn PDF document text
    • https://xcheck.vn/uploads/userfiles/file/zarabufusutow.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/90069498326.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=gta+san+andreas+download+400mbPDF 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_off0000b46a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB46A 18544 bytes
SHA-256: 5c795bcb57c90668adc3fe7d6bd7f9d74f75623c90b703c706294cf77eb30228
font_01_sfnt_off0000e43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43F 10780 bytes
SHA-256: 90f1d044b558cb9a508bab6d95d78d31f0e0cc6a1df858dfbe7f97fcc57f675f
font_02_sfnt_off0000fd30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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