Malicious PDF — malware analysis report

Static analysis result for SHA-256 c52648d2b3d817df…

MALICIOUS

PDF

78.4 KB Created: 2021-05-13 22:37:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: fcaa64cebc3b1ceb12c401a46c76fc11 SHA-1: f8dd22dbba533e82a44b8c2e90f41c407e93bd2d SHA-256: c52648d2b3d817df5756e02c5df96a6afbeb4a2383dc9aedb8debefc600e982f
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier strongly indicates maliciousness, and the presence of external URIs suggests an attempt to redirect the user to a potentially harmful site. No scripts were extracted, but the overall structure and heuristic firings point to a malicious document designed to lead users to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/strik?utm_term=how+much+does+young+life+camp+cost PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486772/normal_60296f475a36d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371244/normal_604d9b82e612b.pdfIn PDF document text
    • http://butitami.22web.org/60471412917.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zovogimobidel.rf.gd/angular_bootstrap_form_in_modal.pdfIn PDF document text
    • http://feselipalez.epizy.com/samsung_5100_battery_pack_manual.pdfIn PDF document text
    • https://88749095-6fd7-453f-8e8a-15b48fe47dd1.filesusr.com/ugd/e4d7df_b9401d1469bc4d9eba0258cc7689ac98.pdf?index=trueIn PDF document text
    • https://50b44c92-959e-4a15-bf83-93d6b2b518d6.filesusr.com/ugd/3ed44c_b62ab5a89947402cb17d7e16f0b6f247.pdf?index=trueIn PDF document text
    • http://bisanake.rf.gd/rewupixixudakedobita.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7372e18-8ee8-4764-bf4c-34cbd8c9d1bc/22535991732.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf5eca09-fb03-4fdd-bc4e-797058d9c592/wibuxilosomenavaw.pdfIn PDF document text
    • https://28f2c00a-638b-45ec-8848-4d649cb6aba9.filesusr.com/ugd/946f28_ae4016b2aabf4c6ba36ce662f3a1a9ad.pdf?index=trueIn PDF document text
    • http://kevefadewa.epizy.com/1607261034.pdfIn PDF document text
    • http://rowomasogig.epizy.com/que_es_linea_de_tiempo_ejemplos.pdfIn PDF document text
    • http://zufodokiden.epizy.com/area_and_perimeter_worksheets_with_answer_key.pdfIn PDF document text
    • https://0d555108-1732-4721-8d72-76d747b2053a.filesusr.com/ugd/1b0481_be14581f6f354c719ad7dc3c18366698.pdf?index=trueIn PDF document text
    • http://gunijikape.rf.gd/rizop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb2772a7-c2d8-4ee4-a409-4d34fb5418a1/how_to_put_together_a_bowflex_bike.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc9d692e-8c51-4f9e-a933-b9ce4a7e2d73/sole_e25_elliptical_troubleshooting.pdfIn PDF document text
    • http://dupikupujetilu.rf.gd/excel_2010_vlookup_different_worksheet.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_off0000f408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF408 5628 bytes
SHA-256: a4f2d7954418256d88a075c48f4c02e7b4ad77fa72dd1584a0a0d890103eabe7
font_01_sfnt_off00010726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10726 10896 bytes
SHA-256: 7b6356ad7fe84e48dbd4b59deb5d34e1a15f08415146a316f8f152d48a15ed89

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