Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6826e58a53d390f…

MALICIOUS

PDF

86.5 KB Created: 2021-09-14 09:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e1bd71f02a08d4ae1dbd68f3ba137867 SHA-1: 50d7cf8423489985ce8f648afa34d19590ca9c89 SHA-256: e6826e58a53d390ff56b70ad13dcb08cf5fcd8190642c906faf01116e45bae20
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many with UTM parameters, suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://drafthe.ru/uplcv?utm_term=black+panther+hd+download PDF link annotation
    • http://www.lbtfilm.com/uploads/files/8285143851.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/41656812066.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/pixesegudip.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/33472233661.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/29645738254.pdfIn PDF document text
    • https://parc-hotel.info/file/jazinozemig.pdfIn PDF document text
    • http://gfb.it/upload/fck/file/34867238485.pdfIn PDF document text
    • http://pronobile.de/catalog/file/xexuxo.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/24703389269.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/72825615366.pdfIn PDF document text
    • https://promise-land.com/upload/file/44831153095.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/wipenuxiwemiwuwegusa.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/86349673878.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/41405057993.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcbff9237b---80104715684.pdfIn PDF document text
    • http://www.forteks.com.br/admin/ckeditor/ckfinder/userfiles/Images/90555829893.pdfIn PDF document text
    • http://bigbazar.cz/is/images/FCKeditor/File/16902360401.pdfIn PDF document text
    • http://karthikeyanjayaram.in/userfiles/file/nubefawikuwikazisaxatewo.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/36867520919.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_off0000ee64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE64 18024 bytes
SHA-256: 1871b08f8f957848dfec2d30f398bde5faba58464c854bd5a844786bc3a27899
font_01_sfnt_off00011ce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134FA 10584 bytes
SHA-256: 25f47f3690f43a2a05c7884809e002975e7366a3f8335839c81312d2010f0c4e

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