Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b2ad2dc385f48fa…

MALICIOUS

PDF

51.0 KB Created: 2020-09-30 01:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 7042837585e7c20ca4706de518d30478 SHA-1: 409aaab1c9e153fc999d9bb209872dd12b047d1e SHA-256: 5b2ad2dc385f48fae9744b33d31e96982c5f45258a6cfac7749d727f19fa9a4e
184 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://cctraff.ru/strik?keyword=speak+now+1+workbook+pdf+vk In PDF document text
    • https://site-1037187.mozfiles.com/files/1037187/90860831016.pdfIn PDF document text
    • https://site-1037187.mozfiles.com/files/1037187/99038173299.pdfIn PDF document text
    • https://site-1036722.mozfiles.com/files/1036722/zepurozikosemexajulamole.pdfIn PDF document text
    • https://site-1037848.mozfiles.com/files/1037848/dimofinenoxodasegowibo.pdfIn PDF document text
    • https://site-1037125.mozfiles.com/files/1037125/97243415639.pdfIn PDF document text
    • http://gokenepar.sproutmeadows.com/uploads/1/3/1/8/131856543/5cc8f560a810.pdfIn PDF document text
    • http://files.robinchaneysart.com/uploads/1/3/1/6/131637553/muvere_nukogef_mojajotoluro.pdfIn PDF document text
    • http://files.dwmfoundation.org/uploads/1/3/2/6/132682868/f5b6ef729a1.pdfIn PDF document text
    • http://vunum.meadowandfawn.com/uploads/1/3/2/3/132303374/4413446.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/9d9cd796-dc30-4122-a49a-fedec488c5ba/dizedidijija.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ad1fbed-afce-4e03-930f-46dbae971a21/toxadikinilo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72c209c3-194c-4eff-8db5-919f77ac2746/66064285772.pdfIn PDF document text
    • http://nitefi.ccsboise.square.site/uploads/1/3/1/3/131380504/5860591.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0eb56d85-a9bb-4d0b-aace-c27f00c5d047/dilelan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6ad4cbc-6c91-4d9b-91ae-46da9a04515c/geruji.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_off00008298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8298 5336 bytes
SHA-256: 719b81d50b8fc51636124049f91431b73939e793d2e0fbe62a79282ce861f9b2
font_01_sfnt_off000094ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94EE 13380 bytes
SHA-256: f6818e79675a13d560dc5095ccae6fb765653953b18042f04e542ad6360de14b

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