Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdc199e378457fc8…

MALICIOUS

PDF

79.2 KB Created: 2021-09-22 20:58:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d7d9cc3221b27e7f52aff7308c637ab8 SHA-1: 41d6b896b5831620d9d8e9a282ed8ce184a800b5 SHA-256: fdc199e378457fc804bfa5a1252fd501c3b7049dd4fba27af2370585751c13c9
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier as malicious. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm. The `PDF_SEO_DISPOSABLE_LINK_FARM` heuristic indicates a pattern of SEO manipulation or potentially hosting malicious content behind these links. The `ML_NYX_PDF_MALICIOUS` heuristic strongly suggests malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://garglob.ru/uplcv?utm_term=online+gun+games+to+play+with+friends PDF link annotation
    • https://ikima.fr/uploads/file/67892082544.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/64948750003.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/29307973918.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/fogoberidabegabusafoguzut.pdfIn PDF document text
    • https://service-panev.com/userfiles/lofijoxenirozafuwimifew.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613deeaec0173---dukigokefexo.pdfIn PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/95140639053.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/6141be34b5d62.pdfIn PDF document text
    • http://roocenter.ru/upload/file/21020734048.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/botazabemuji.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/zipivexatetaruvoxiv.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/13423127314.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/1300796822.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/79142335453.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/desudu.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/13147601018.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/82872236581.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/lafivinexuzomewepebugivas.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/vovepagazatu.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/65281059791.pdfIn PDF document text
    • http://olivetheater.com/userData/board/file/rekawibox.pdfIn PDF document text
    • https://dpdpunjabi.myskoolapp.com/FCKeditor/FCKimgUpload/file/99495884522.pdfIn PDF document text
    • https://airbays.com/userfiles/file/tematimotinemugaso.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_off0000ce24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE24 11268 bytes
SHA-256: e06d30f1b6d7273f9416b1a230d4c8fc4b9c1062afa13e39bb45e46269f65224
font_01_sfnt_off0000e84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10060 18028 bytes
SHA-256: 6cf673547b05904de458c93a372aa12d2e1daac7ca2c4db5454b796a7521dfe9

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