Malicious PDF — malware analysis report

Static analysis result for SHA-256 18c38c413ad61ee1…

MALICIOUS

PDF

49.7 KB Created: 2020-10-05 07:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 569edced5eeceb25789314ee422b8ae2 SHA-1: f1748b84346a94d5087b5a3a6fa43f9118e04528 SHA-256: 18c38c413ad61ee1d0c63a00fcc02fc6fa788e8209e53be249ef17042a177b10
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=first+grade+reading+comprehension+st In PDF document text
    • http://files.komyoreikidonewyork.com/uploads/1/3/1/3/131379991/renakasaw.pdfIn PDF document text
    • http://files.bloomingfulbirths.co.uk/uploads/1/3/0/7/130776602/6398f.pdfIn PDF document text
    • http://files.avssu.ca/uploads/1/3/0/9/130969725/rixawewizuwonaj.pdfIn PDF document text
    • https://site-1039135.mozfiles.com/files/1039135/ruwizureduxanor.pdfIn PDF document text
    • https://site-1037035.mozfiles.com/files/1037035/pozasenanekurubaren.pdfIn PDF document text
    • https://site-1038497.mozfiles.com/files/1038497/rivugolisedulif.pdfIn PDF document text
    • https://site-1037205.mozfiles.com/files/1037205/30108435154.pdfIn PDF document text
    • https://site-1038788.mozfiles.com/files/1038788/6160970494.pdfIn PDF document text
    • http://senat.tinyhouseexperiencedetroit.com/uploads/1/3/1/4/131437889/lulamogiluw.pdfIn PDF document text
    • http://files.mrselizabethroberts.com/uploads/1/3/0/7/130775318/gizelazezudati_wipanad_fapenuruvetipaz_panodut.pdfIn PDF document text
    • http://files.centerforpentecostalministry.org/uploads/1/3/2/6/132681579/38ed99.pdfIn PDF document text
    • http://files.werbrave.com/uploads/1/3/1/4/131483955/xaxuxirijufives.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2131/8818/files/the_revolution_will_not_be_funded_full.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/0258/9094/files/70267546163.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/6316/1244/files/gamutuwirozural.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_off0000851e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x851E 5408 bytes
SHA-256: f816e08f80f68fa7684d673ce262f50e9b675052fb821b6b2a4247469a36d807
font_01_sfnt_off0000975d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x975D 10208 bytes
SHA-256: c1686c44798a61e053fb01c622e4d03a8beea7cacb0d441535b7d85a149cf730

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