Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebf259a412cd3dfd…

MALICIOUS

PDF

50.3 KB Created: 2020-11-06 02:23:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: b446b845400501037062a527887efe00 SHA-1: 9efe9556366efe5c86e456b0c22ea72ea3c04125 SHA-256: ebf259a412cd3dfd2e1e263acdc0f3cd6d6fe19fae619ea120eaa03bb40c5120
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains an embedded URL that redirects to a domain known for hosting link farms. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of numerous external PDF links, suggesting a malicious intent to manipulate search results or distribute further malicious content. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or content-luring attack, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://traffnew.ru/123?keyword=devotional+books+for+2020 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386842/normal_5f9898db332df.pdfIn PDF document text
    • https://tetobalowuw.weebly.com/uploads/1/3/4/5/134523757/kebozu_didizovoniremu_tejexu_sunakexofulot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367287/normal_5f895c87c8005.pdfIn PDF document text
    • https://nepagezefo.weebly.com/uploads/1/3/4/4/134472827/fedcdc5720c.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/nupotukig/kotpal_vertebrate_zoology_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4caf79f1-6ad7-43f8-bde0-317fb4275e4e/doom_4_classic_maps.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2ead409-2bbf-4853-a9b6-e6a0e9cb19d9/gaps_grid_template.pdfIn PDF document text
    • https://s3.amazonaws.com/fikuvine/biochemistry_mcq_books.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/steps_to_writing_well_10th_edition_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/sanekufiwumafo/about_me_fill_in_the_blank.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fe68fa9-f087-42dc-951c-2f1a3568bd44/.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/84723313847.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf129ac2-e5b9-4408-9c5d-f0f4c210cf85/xefevilinod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65f0b635-c92a-452e-b90d-517e6f7cdaa4/how_to_get_gunpowder_in_minecraft_hypixel_skyblock.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e90a7c50-f1f5-449a-ae5d-5061798d3b00/inca_elementary_school_lists.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_off00008288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8288 5300 bytes
SHA-256: 909cb61226a1da6021976288d082e7b6fd119a2a18536f7ca212ba7da2ed14a8
font_01_sfnt_off000094a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94A5 11368 bytes
SHA-256: 6410801509eefea91eecedc8a5ebf6448020d32c038f204c795417a98f424808

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