Malicious PDF — malware analysis report

Static analysis result for SHA-256 51ebe16af4e15344…

MALICIOUS

PDF

75.7 KB Created: 2021-02-28 00:21:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a0e43684b50fa167b0a5163694b7b5f9 SHA-1: 3be6c608660d31123f34b9145eb4615431dcfa67 SHA-256: 51ebe16af4e1534401785e0c4f12e34c4214154d0f2df45651ff776fef572be3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely to distribute malicious content or phish users. The presence of external URIs suggests the document's primary purpose is to redirect the user to a potentially harmful external resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/wb?keyword=classics%20of%20philosophy%203rd%20edition PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4404955/normal_5ffdeb0034475.pdfIn PDF document text
    • http://detonic-italy.website/close_up_c2_answershtfqu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386094/normal_600d843f0d5aa.pdfIn PDF document text
    • http://pugisapi.mypressonline.com/nosinemoni.pdfIn PDF document text
    • https://jeduwenerapowi.weebly.com/uploads/1/3/4/6/134678879/jozunatajolevoxu.pdfIn PDF document text
    • http://mitsumoro.ru/18290544925v8ar9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450734/normal_60065656b3d5c.pdfIn PDF document text
    • http://yoptan.space/chamberlain_clicker_universal_remote_control_troubleshootingeqbcz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409614/normal_60286cdc1e3fb.pdfIn PDF document text
    • http://good-production9.site/how_to_stop_beach_erosion_on_a_lakeovqeu.pdfIn PDF document text
    • http://fito4ka.xyz/libros_de_logistica_y_distribucioni4jie.pdfIn PDF document text
    • https://wumigativagulam.weebly.com/uploads/1/3/1/6/131637174/nepopusiveja_gomumesos_zalivi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/64784878873.pdfIn PDF document text
    • https://s3.amazonaws.com/bivanud/opera_mini_8_for_java.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B2 5416 bytes
SHA-256: 34bba38bf6baf45c180c9d98d004932e6e5bb6b76428c2b8f72c570d2a911b81
font_01_sfnt_off0000fc1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1B 11100 bytes
SHA-256: 00b87d140acc7922059ad3b9f238cd71b48957fc25e2c192638ad4aa4e56eb69

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