Malicious PDF — malware analysis report

Static analysis result for SHA-256 8df7b84525e1b66a…

MALICIOUS

PDF

80.8 KB Created: 2021-10-08 19:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 856ccdd820a3748a56f936c2fa602c88 SHA-1: 4eb78c0d369fef5551d4bab8391c25342e95e872 SHA-256: 8df7b84525e1b66a8ee676e8613877ad25385aed24b3223a42c03ba3a7804675
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. This suggests the document's primary purpose is to redirect users to potentially malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/gabazimulatox.pdf In PDF document text
    • https://gikguamerica.com/userfiles/file/83793228590.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/gokiwimunixes.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/36568124286.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/pijuw.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/kawijuk.pdfIn PDF document text
    • https://greenways.at/userfiles/file/posedixitek.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615f62c1a24c9---95844703589.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/gipedajew.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/41875429416.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/37898516012.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161538cb239085---maduvavilogofisu.pdfIn PDF document text
    • https://losaltos.com/wysiwygfiles/file/50712413323.pdfIn PDF document text
    • https://drgcode.managenet.ro/images/file/95192603890.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/27474513101.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/tamijelagokefisado.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/bawikufuwanejolak.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/bebifonupip.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/58803437663.pdfIn PDF document text
    • https://cicimanis.com/contents/files/60451534741.pdfIn PDF document text
    • http://mylodge-naoshima.com/kowafuf.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/xivigex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=three+common+multiples+of+12+and+18PDF 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_off0000d1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA04 11328 bytes
SHA-256: 711ff5b57d8797e8bb60a43f1c54a349c7ad3ec1ae43f9c1162086e1ac727dff
font_02_sfnt_off00010489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10489 18956 bytes
SHA-256: 5d938e7ce7dff91cc8f37cbe20cfcc85e488bfa8c4fec2ec77b33ccd0bfa2b02