Malicious PDF — malware analysis report

Static analysis result for SHA-256 b421e8e9dbb152da…

MALICIOUS

PDF

52.6 KB Created: 2020-10-17 23:50:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: e5e68164d548992d9af356e48b8090ea SHA-1: acd8064da010305585c3797a01a6541c2acac70c SHA-256: b421e8e9dbb152dafdbc4e44f3120624bae0eceb97aa56281b3b62edcbb8aa5a
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=whatsapp+messenger++for+tizen+version In PDF document text
    • https://kokubexajaluk.weebly.com/uploads/1/3/2/6/132681668/gigabukoles.pdfIn PDF document text
    • https://zusaneji.weebly.com/uploads/1/3/0/8/130813769/1598197.pdfIn PDF document text
    • https://boguvetasitob.weebly.com/uploads/1/3/1/3/131380850/towuf.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/e5bcd2697.pdfIn PDF document text
    • https://jarapitoxedomel.weebly.com/uploads/1/3/1/4/131437170/7639485.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366365/normal_5f87524f349e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369908/normal_5f8abdc654550.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368767/normal_5f8800b539cc0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367947/normal_5f88ef1b18a38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366952/normal_5f872a9582215.pdfIn PDF document text
    • https://koxoganonigowup.weebly.com/uploads/1/3/1/4/131408343/ddd948c9.pdfIn PDF document text
    • https://sirawomaperuli.weebly.com/uploads/1/3/1/3/131398091/rotapulofiminiju.pdfIn PDF document text
    • https://vewutaniwem.weebly.com/uploads/1/3/0/8/130873717/xemobukivodi-sumamajonoxini-mofosilujojo.pdfIn PDF document text
    • https://tudupumodowi.weebly.com/uploads/1/3/1/4/131406798/3080876.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/aa139dad-a15f-4ad9-b7f4-bfbb3627947f/bupatisozeriz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9619d88-634d-499d-8668-4b115ccd2828/nawifowevugivepa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7360b249-d7d8-478d-8d81-a0776245e825/pilates_springboard_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/3336/1045/files/workforce_reshaping_operations_handbook_opm.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/0241/2196/files/dasukorufejumeguliv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/4155/3046/files/68067365779.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_off00008d5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D5D 5408 bytes
SHA-256: 74e39ea288998360aac84c81f8246ddc70afd6d1e51d9c43c74eaa8c470ac57e
font_01_sfnt_off00009fbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9FBB 11200 bytes
SHA-256: 57b34f0797e41d46d19b80ed0f6bf9d6e5822c032ca498461d1593b1a817335d

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