Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2371ebd89b3a143…

MALICIOUS

PDF

81.4 KB Created: 2021-09-09 01:34:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1d84fc7185492e7300b7af3e2840c654 SHA-1: 1c0a69e7cb353a71ef4d9370a23d18ce4eefbde6 SHA-256: d2371ebd89b3a143062a8a94fcb83f33dbb32e457ef08ee9a1d9a51a42e81223
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple disposable domains, which is a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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.
  • 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://minhphucvietnam.com/uploads/userfiles/file/18351919126.pdf In PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/67868707064.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/tikoxamobulabogafak.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/lemamirurokozogolorupib.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/fepamorunukikurijuditipe.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lizemetuto.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/zavezubefenejileva.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/kezusur.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/senubokefajavatipas.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/ruboriwatasevuzojox.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/93337629927.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/fajezusaj.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/xakafegivilipowikij.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/lewugozegejevulodakesofu.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/92647778378.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/mowasobojunupopiwegonami.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/18d0c89940b67f440d603c842a8c37b7/fexebi.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/95600635795.pdfIn PDF document text
    • http://flomojapan.com/upload/files/92514379022.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/c02348de69a068df6be2fef236e4d97a/99566806031.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/66797256618.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/wuzudufuxazesulosape.pdfIn PDF document text
    • http://zjleiou.com/images/upload/File/sidabubogotute.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/rafivojogamav.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/63203228429.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+block+dating+sites+on+androidPDF 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_off0000d8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E7 17584 bytes
SHA-256: 7d0aa065e3c77781c9e7291c1055ee1ed36f876b370aed52b3c58245cfc1b7f1
font_01_sfnt_off00010689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10689 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA0 10856 bytes
SHA-256: be3f597e502e8612603c33e0a8c61fdf9adb3bbb92f08805f31ae478fb4695dc