Malicious PDF — malware analysis report

Static analysis result for SHA-256 67877f262721bdc7…

MALICIOUS

PDF

79.5 KB Created: 2021-09-15 23:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 901670fcaa38c53fa5daa44644548742 SHA-1: 938cc95d6e034dd85f63860189545f692114b9ee SHA-256: 67877f262721bdc753bb6dd38c06e1323dba2b711c26045360817a22c7fcaf94
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, such as http://www.heksan.com.pl/file/29519119413.pdf, likely serve as lures for phishing or to download further malicious content. The presence of external URIs and the overall structure suggest an attempt to direct the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • 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.
  • 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://www.heksan.com.pl/file/29519119413.pdf In PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/8113gvluif9rbcqpg6pibr9i6t/80599893512.pdfIn PDF document text
    • https://akvanova.ru/sites/default/files/dokewatupezitavisubive.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/parezebekat.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/24634983751.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090520505173499.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/12639287651.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/10866003681.pdfIn PDF document text
    • http://aguito.madteam.net/ckfinder/userfiles/files/zisilubuwi.pdfIn PDF document text
    • https://energooptima.hu/upload/File/dabekolijesesi.pdfIn PDF document text
    • http://itps-group.com/uploadfiles/file/66183711001.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/51453519544.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16141b99211a6b---belenumejewikumapem.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/38459431927.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/081326452143.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210901202351_851402182.pdfIn PDF document text
    • https://ka-base.no/images_students/files/52559928697.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/mosomosoji.pdfIn PDF document text
    • http://irs-messtechnik.at/upload/mobekukarevu.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/6378336445.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/sajerab.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/39234960026.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210901_E767BEE73ACAD94E.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/31977936701.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=island+war+mod+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_off0000d4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E0 17096 bytes
SHA-256: a09f3ed0c46166c174bb6dfc69e9210bf881c2a99a6005c325e3b339af5e87c3
font_01_sfnt_off0001017e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017E 10360 bytes
SHA-256: 449ccc2991fae1d4c8c77feabe3c119e98499c37dee00cd18853da87652c355b
font_02_sfnt_off000118e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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