Malicious PDF — malware analysis report

Static analysis result for SHA-256 6806e3b296a25c96…

MALICIOUS

PDF

81.7 KB Created: 2021-09-17 19:15:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d243f5e0f0175c52ca11650473d2c01b SHA-1: 4bf014dfa2643b87196cab551dc2cc924a8ffb92 SHA-256: 6806e3b296a25c961015857a3b90fdf6455d0bb468dc017350326bd0eb1a78b0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm directing users to numerous external domains. The presence of multiple unknown URLs suggests a phishing or malware distribution attempt, likely initiated via spearphishing attachment. No scripts were extracted, but the PDF structure and URL patterns are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://samsunyapi.com/userfiles/files/mugusozusezudodibalos.pdf In PDF document text
    • http://wib24-admin.de/uploads/file/68327331422.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/difuzorofelawaluvi.pdfIn PDF document text
    • http://sourceit.ke/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/revoxegazibarameligujewam.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/zarevemijokoverekapapeb.pdfIn PDF document text
    • http://1000projects.ru/upload_picture/file/71725053140.pdfIn PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/64337718911.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/rorovadaferejovuwej.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/23099565950.pdfIn PDF document text
    • http://yusungchart.com/userData/board/file/tutolilureziwenuzaxakajo.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/28275116623.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/25856605968.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///vasuwegaxomufidiz.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd65628827---99369122618.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/leloveweb.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/56592745836.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/fobokobi.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70321022532.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/pobokizida.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/fizewibabopewopolubuxuwi.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/8908901286.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=the+amazing+spider+man+2+mobile+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_off0000d9ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E1 11116 bytes
SHA-256: e1b512c59f0bf824929acfeb5abfefa9dd6c60eacaac8f81008ae173d0957bf6
font_02_sfnt_off00010b2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2F 17624 bytes
SHA-256: dcffd10a677c8dbd0944dfdf6bc0fad9d010c10ed8d50b9351e6ad49c0302712

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