Malicious PDF — malware analysis report

Static analysis result for SHA-256 472fa5adc01e80bc…

MALICIOUS

PDF

72.8 KB Created: 2021-09-09 01:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b905baff8d58ac957d6893b108c8875e SHA-1: 4a673e724c354d507d5c0740c86f3ca8f2972ff7 SHA-256: 472fa5adc01e80bcc1965b406faea057949cdd3d67b94384342553407e95bf1f
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 4

  • 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://oniceh.ru/uplcv?utm_term=blue+bloods+season+1+123movies PDF link annotation
    • http://weddingdove.tw/uploads/files/202109061629385604.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/18978872591.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/zudenozelowonifetopelib.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/bilalajisawavudufevurilo.pdfIn PDF document text
    • http://195exim.com/datas/files/30612693866.pdfIn PDF document text
    • https://phunhai.net/upload/files/28958155900.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/zoredoxujobe.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109041657298909.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/d0fh8tjgmckfn3hvkkt5ft4jf0/zubazemo.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/95190139352.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/tidasukadubirepanowozo.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/wamuvozojufamumom.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/bokipedawozatutelofesi.pdfIn PDF document text
    • http://intertravel.hu/_user/file/zepidobodopa.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/55397732835.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/71381132518.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16135df0469c85---70985004443.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/45000207443.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/32841698477.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/80296086790.pdfIn PDF document text
    • http://domesticsolutionsagency.com/userfiles/file/81367604309.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_off0000b9ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9EF 10916 bytes
SHA-256: 52cacddcdb65f3c768ae9f4b354fd66c3e7fd28554e14bed4a6dc91f089ed3aa
font_01_sfnt_off0000d340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD340 16456 bytes
SHA-256: 56126147e700ffb03c41f6d7df96fde928b7929c8b3d1e0a3b02dd2ff9dcfe7e
font_02_sfnt_off0000fd9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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