Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4655cd64c0a42e8…

MALICIOUS

PDF

81.9 KB Created: 2021-09-11 23:13:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8784626408057cfde494d613f7e031e6 SHA-1: 07d9a2213b5656cc04759c7e29462ecb5b3837b1 SHA-256: f4655cd64c0a42e8346299950853d3149acf2087bc06691d7129f8e2e2c2a9c2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to potentially malicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

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://sooam.com/files/fckeditor/file/7636356376136f6b4cb418.pdf In PDF document text
    • https://drjou-vc.com/upload/files/95915480535.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/jetavo.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/75636750474.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/2958339841.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/lubajovurajalitu.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/wisuzisegaxaxirabunetita.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/21775719464.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371264ec3e2---53690599344.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/faxinejomowaled.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/didipifidefulowuvileligaj.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/36263608780.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/tabuzigadopasesav.pdfIn PDF document text
    • https://mmszke.hu/files/file/81806790855.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/wiwijuxipokixedi.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/36769988057.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/020658091161.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7841ed67b---vefas.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210901175748.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/ludomebipun.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/70648666242.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/sominazebegut.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/23701610882.pdfIn PDF document text
    • https://negaratoto.com/contents/files/jazebadataxizelizasowukag.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/kixejumizufev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=lol+apk+free+downloadPDF 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_off0000db66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB66 18336 bytes
SHA-256: dea50bf1f5111f70ff3072ecb20d99ae14c76772f1711e289c6ef4aba1f570c6
font_01_sfnt_off00010b2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2F 10268 bytes
SHA-256: c4f5509cbe2138857b5138cbbd489b72a560d1e017e47898cacea42af807ebf0
font_02_sfnt_off00012272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12272 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1