Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fcbc2f188b9004b…

MALICIOUS

PDF

58.2 KB Created: 2020-09-29 22:52:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 6e6da8bc7ec9aca835ce0ba2655e253d SHA-1: f9fb6690b048a05a5559dacb8dba6b98835abd54 SHA-256: 3fcbc2f188b9004bd0f071e031faaa804651b79ca618f13735a9022493f4bd7b
192 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=barbara+oakley+learning+how+to+learn+pdf In PDF document text
    • https://site-1036724.mozfiles.com/files/1036724/boziw.pdfIn PDF document text
    • https://site-1037157.mozfiles.com/files/1037157/sevimuwamonufedemode.pdfIn PDF document text
    • https://site-1037003.mozfiles.com/files/1037003/4123944608.pdfIn PDF document text
    • http://sawedulot.adelaideflowerwallexperts.com.au/uploads/1/3/0/8/130814229/dilabube.pdfIn PDF document text
    • http://files.bouldervoicetherapy.com/uploads/1/3/1/8/131856991/rifawozo.pdfIn PDF document text
    • http://fusibax.sotxwellness.com/uploads/1/3/1/3/131397989/6318408.pdfIn PDF document text
    • http://vusuje.criticaltourismstudies.com/uploads/1/3/0/7/130739663/tunelopep_tonibetuwaziz_bajazewuti_kofirexikabuw.pdfIn PDF document text
    • http://files.ninasestanovic.com/uploads/1/3/1/0/131071196/lepasog_rigofatido_kusepajirozidej.pdfIn PDF document text
    • http://wobol.idealdrycleaners.co.uk/uploads/1/3/0/8/130873949/949a6.pdfIn PDF document text
    • http://sesivux.kingfisher-strategy.com/uploads/1/3/2/3/132302868/9874854.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/95a5ddf6-0ea8-4395-acbc-a8d97902f501/wakanis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e51c3b4d-15e0-40e1-bf3b-40f313366734/78950709527.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa349785-7142-4f7c-8c4d-0003b9f60e6b/59240309307.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c95ef72-ca4d-4a57-916b-7bfc2482be32/61559977034.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60AF 9280 bytes
SHA-256: 26b1477689f83f970fddc4b866a19af5c4957a81a3124151d3ea2b74084bdbce
font_01_sfnt_off00007ef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EF8 5572 bytes
SHA-256: 69de6c449b5e33be58ebfd098f2a4152e497d3c603a3121553f7196beeff66ba
font_02_sfnt_off00009200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9200 4816 bytes
SHA-256: 512086ce22919df59bc33263269b7a4f2506dd8f155962f07770d73108423840
font_03_sfnt_off0000a382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA382 9976 bytes
SHA-256: 00c9c89d5be37c7bf18b7ed8e6cefb4cd55e5192906abdcf49fba4af083d0ee9
font_04_sfnt_off0000c5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E2 16064 bytes
SHA-256: 378ba5569bb666bbcf62f6b10ce7b1b17e3ec70dff13df96b0486da8cd924b4e