Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a3438a2159a0026…

MALICIOUS

PDF

70.0 KB Created: 2021-10-07 00:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6d63e775623c435ea8b18dc56b1d13de SHA-1: fd93ff90bb40190b19a60e4ed20a8713f42c5fa9 SHA-256: 3a3438a2159a00269a6d91eb9a9ae14cf6105b955990369864d942bb524a826a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript and a large number of external URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The embedded JavaScript and numerous URLs suggest an attempt to redirect the user to malicious sites or download further payloads, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://queure.ru/uplcv?utm_term=study+of+methods+of+purification+of+water+project+pdf PDF link annotation
    • https://satuldelut.ro/ckfinder/userfiles/files/51714068866.pdfIn PDF document text
    • http://egitara.com/upfiles/files/45412290210.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/031844235548.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/51849637171.pdfIn PDF document text
    • http://ty-int.com/files/files/wadarebumewibadujunivila.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/49185702106.pdfIn PDF document text
    • http://chikatere.com/Upload/files/pupuma.pdfIn PDF document text
    • http://zensushidanapoint.com/uploads/files/savisuvipokazajitezufo.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/vivifoxasutefodosazoxinov.pdfIn PDF document text
    • http://bndweb.nl/upload/files/fixozerivebemabe.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614d9157318f1---16472419064.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/76240514699.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/bivege.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/sokemavisejinovovufexebeg.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/20716335859.pdfIn PDF document text
    • https://renault-service.com/userfiles/62105886714.pdfIn PDF document text
    • http://p-jtech.com/userData/board/file/40225386571.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16132100a9ea58---31917891258.pdfIn PDF document text
    • https://kawanmto.org/contents/files/81885132479.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/17070476182.pdfIn PDF document text
    • http://abcgsgeds.friendship-match.com/upload/files/69027353428.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/zoladem.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/bawonuwigamoniluvo.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_off0000b2cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2CB 14540 bytes
SHA-256: 8d32b12721017987bbece7774feb69d0af9f10ae9aeefe224ff0d5f567fdb411
font_01_sfnt_off0000d70e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70E 11344 bytes
SHA-256: 69116d85da3fa63aa748f8f00125e3ff8703a17859c52e53c7df9a62243cbc00
font_02_sfnt_off0000f1ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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