Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1ec48690845a066…

MALICIOUS

PDF

88.0 KB Created: 2021-03-09 11:47:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: fd8005fa69c5e7198db906ed06fd99d4 SHA-1: 4b09e31b94f2835a796a4707ba4f22d33e212ea6 SHA-256: d1ec48690845a06657b994346477315585f0ff580c92f4a26291b5cc2e5e08ba
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a link farm and an embedded URI pointing to 'jacksth.ru', suggesting a phishing or malicious content distribution attempt. ClamAV detection and ML classification further indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jacksth.ru/award?keyword=chinese+dictionary+download+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403428/normal_604302e52201c.pdfIn PDF document text
    • http://futajef.medianewsonline.com/la_foule_lyrics_edith_piaf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404740/normal_5fdd3dfb3ecf4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425772/normal_5fdec312581a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376374/normal_601ac55cc976e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459324/normal_5fe0040e3e923.pdfIn PDF document text
    • http://warupipujamoru.sportsontheweb.net/1260048382.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/49397abe-2b40-4d39-83b1-3aa8ac30918d/what_is_secondary_data_analysis_in_sociology_quizlet.pdfIn PDF document text
    • https://ed36ca5d-e6e9-4caf-8bbb-3a8af5cfee16.filesusr.com/ugd/971556_f75f6d9ae3fa4043be1847b57f20e1b8.pdf?index=trueIn PDF document text
    • https://91e55214-10ad-44cf-a10a-60a9392df58b.filesusr.com/ugd/e1c37d_1b101213a059405f8a21fabade5831b5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/juvetaso/answer_club_regulamin.pdfIn PDF document text
    • https://80c93ba6-74df-4afb-9852-3a83eaba20e3.filesusr.com/ugd/4cf28d_11df1da562df445f97f273a49d840585.pdf?index=trueIn PDF document text
    • https://901c4554-6fda-40bf-8344-1f1538f5dc06.filesusr.com/ugd/a76634_a5b0828de7fb488eb6408487099dccb8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wulagisi/95928659792.pdfIn PDF document text
    • https://11fe2947-f393-4df3-905d-f9f3730e834a.filesusr.com/ugd/b1b16e_7218607a04d8441fa744e44ba21b8687.pdf?index=trueIn PDF document text
    • https://12f7643e-9106-4823-89c2-0bdaecd1bc22.filesusr.com/ugd/1f6d71_2639bd4fec4548aa8fff2442297b302e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gopuze/formule_arrondi_pourcentage_excel.pdfIn PDF document text
    • https://d0fd53c2-66a5-49f7-a942-a4bfc50892a3.filesusr.com/ugd/11baf9_d6f8c53a33954acc96a0e80f4352be53.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jiwisi/unikey_cho_macbook_pro.pdfIn PDF document text
    • https://6f2fb29c-15f2-4b08-b525-3eb91a7f0a41.filesusr.com/ugd/c3548c_b78e5884466a44658dcb02a46b7438c9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/65018615548.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a768f59-2029-497c-a80f-57bff4ff1a83/suvotenojizejonemilujifut.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_off00011cae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAE 5344 bytes
SHA-256: 9c0bdcdfab6b2b50ba65c7c680ad94859a5d3d6cf25486f9e2eb856508fb3ddd
font_01_sfnt_off00012eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EED 10440 bytes
SHA-256: 7d6d19086e8c2ed0f6d1e97d0d4d476b5a520a0c6b8ff221ad6d33afd34df479

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