Malicious PDF — malware analysis report

Static analysis result for SHA-256 452de3633c0af890…

MALICIOUS

PDF

39.5 KB Created: 2020-10-03 00:43:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 0522b016e27a7a27a0e8dde8942ff18e SHA-1: f4eb63bae50a92c119ccc9a5b77763ac5a650f2f SHA-256: 452de3633c0af890904a6680b8e93531ea7660a0f046b92c6212297cd5d54fb0
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=complete+chemistry+for+cambridge+igcse+revision+guide In PDF document text
    • http://vegulusix.ameliasherry.com/uploads/1/3/1/3/131379730/kejelebizogela.pdfIn PDF document text
    • http://files.applesandbooks.com/uploads/1/3/1/6/131637240/sikuzaguwavotum.pdfIn PDF document text
    • http://files.kaitcalabro.com/uploads/1/3/2/7/132712235/3718701.pdfIn PDF document text
    • http://files.robertfreedmanagency.com/uploads/1/3/0/8/130873872/kewexatejakuwe-dolixopafisudat-lejagilefin-bobaxe.pdfIn PDF document text
    • http://xaxorotux.genessajackson.net/uploads/1/3/1/3/131378932/monululibowazepokari.pdfIn PDF document text
    • http://pipem.walkbostonhistory.com/uploads/1/3/0/7/130739726/xegizapo.pdfIn PDF document text
    • http://files.chiminisiberians.com/uploads/1/3/2/7/132710780/7fdc5bf48522.pdfIn PDF document text
    • http://files.petervircks.com/uploads/1/3/1/4/131437249/rutewijusuwu.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/9c22810b-3159-4d13-9de0-56d1e152b722/32093812778.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3180076-f7bd-4f67-9467-3a352181eedb/kekegozilevimuxolebad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a38b5775-db29-46d1-8422-915432981cda/54133077336.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75d3499e-ff82-4acf-a1c9-df53b61ea5ca/muzujinurefasuwula.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a529aae-d873-4bb9-8117-087d05dde586/pasoriritixorofiwirez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81ddd5ba-528e-4ada-bdd3-405c1b80abf6/deforiwipulibawaju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f5c5b94-ef98-4d3f-8119-10b06fc530b2/sovigawikerajibalizo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5be1e704-76dd-4e17-9dab-35a70db9187a/87697092658.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_off00005a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A35 5776 bytes
SHA-256: 16c6d80fed7d1d17efee524baa30b27afd9b78e659d7616536adc367586f97ae
font_01_sfnt_off00006db8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DB8 10260 bytes
SHA-256: abcdaee53f4a97e1dba4b0251541e3d83dfa2e29a806c6559cb40451f4ed482d

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