Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d4d7e565d018f4e…

MALICIOUS

PDF

46.5 KB Created: 2020-10-01 13:41:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: b2accb1f003e535d5fab81cc936c3372 SHA-1: 623274e6eadb7f5e1ab67f67165f2ddd120fea56 SHA-256: 8d4d7e565d018f4e1103901e8871bdbd93b8117c3b99c499737bfd87dd403b58
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://ggtraff.ru/strik?keyword=adjetivos+en+ingles+comparativos+y+superlativos+pdf In PDF document text
    • https://site-1037129.mozfiles.com/files/1037129/rupibafaganebesepol.pdfIn PDF document text
    • https://site-1037893.mozfiles.com/files/1037893/kizilakovas.pdfIn PDF document text
    • https://site-1036651.mozfiles.com/files/1036651/pewogowilesatijasetut.pdfIn PDF document text
    • http://mebar.leslievilleschoolcouncil.org/uploads/1/3/1/8/131856590/raradukuf_fetud.pdfIn PDF document text
    • http://files.cladstudioz.com/uploads/1/3/1/3/131383251/e6ef33389d7.pdfIn PDF document text
    • http://files.davertskate.com/uploads/1/3/2/7/132740415/2706649.pdfIn PDF document text
    • http://vemet.sallylutz.com/uploads/1/3/0/8/130874299/vopajatoxewim_gunaragaki_volefa_baliroju.pdfIn PDF document text
    • http://files.glenbraebathandbody.com/uploads/1/3/1/4/131408153/gumixuzo-sejojebobota.pdfIn PDF document text
    • https://site-1038614.mozfiles.com/files/1038614/32120736552.pdfIn PDF document text
    • https://site-1037219.mozfiles.com/files/1037219/vetuje.pdfIn PDF document text
    • https://site-1036753.mozfiles.com/files/1036753/namaxa.pdfIn PDF document text
    • https://site-1037059.mozfiles.com/files/1037059/wavakevavasala.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/2b080d9a-ad6e-4167-986d-9fd1aaefb1b6/62477112810.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32ee0de1-7955-4ead-92c2-6a1cd511d356/potaxoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcd57b73-92ba-44b5-a65b-b9505a7d3a55/38180941318.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_off00006ae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AE3 5700 bytes
SHA-256: ec968bcbf51ddad509088e0c956138ebba492de8f68b9e7b3d541cd0a4dcdc07
font_01_sfnt_off00007e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E52 14796 bytes
SHA-256: e9859133d59f4da38a55b206eebe0528adcccf1000a342952cb1f51f35aaf7fb

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