Malicious PDF — malware analysis report

Static analysis result for SHA-256 1067c351d4e03559…

MALICIOUS

PDF

74.2 KB Created: 2021-09-15 05:05:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0f7bca72bb272f355d5205e69a39adc0 SHA-1: dc4907b1ddda66e8a8a612d720bb3dba91c7fb27 SHA-256: 1067c351d4e035592519fde543ae5e4c687fc725cddbec0c14439d95a6fa7ebc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file with embedded JavaScript, flagged by ML classifiers and ClamAV as malicious. The PDF also acts as a link farm, directing users to multiple external PDF files hosted on various domains, indicating a phishing or malware distribution attempt. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://depcip.com/app/views/panel/ckfinder/userfiles/files/bodanonodumizijigaxoga.pdf In PDF document text
    • https://leganordavigliana.com/uploads/file/28536194436.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161412abbbe886---59762937354.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/gopipat.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/diwawaporupebuzo.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/72651105423.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/84488009101.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/kimepakapifutevega.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/94851069357.pdfIn PDF document text
    • http://feminella.ro/upload/fck/jikijibebev.pdfIn PDF document text
    • http://sarigol.kr/userData/ebizro_board/file/42578574787.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/zamugelosenozibokupo.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-7/20210907043709111597.pdfIn PDF document text
    • https://premium-house.uz/images/file/13061025491.pdfIn PDF document text
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/kumugakanomifinivisopolof.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/19914518225.pdfIn PDF document text
    • https://lalicorne-hotel.com/userfiles/file/36620430276.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/39342714433.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/90584820818.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/25156340404.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/zesumulepijatovoselare.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=illegal+movie+appsPDF link annotation
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/fusavesovofowe.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_off0000bd73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD73 10308 bytes
SHA-256: 6086a96ea5b122e61e5b8bdddf36e4cdb8facdb0bc99d4610e4c687e3c67a98a
font_01_sfnt_off0000d4ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AE 18104 bytes
SHA-256: f69dce002abe0dab1e2ef0572910ba69744522f2d9875b7f1019d80404b565f7
font_02_sfnt_off0001033f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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