Malicious PDF — malware analysis report

Static analysis result for SHA-256 418ef375bd99a49d…

MALICIOUS

PDF

60.5 KB Created: 2020-12-16 07:42:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a5344210bd24eea341f7b55b33de96cc SHA-1: ddb1d6dfdcf96963bf63164109bde113aa8b2907 SHA-256: 418ef375bd99a49d7725bbf9068d9aa1c7073268770a32fff9f1bb89a86e32cd
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many pointing to disposable hosting and redirectors, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded URLs, such as 'https://cctraff.ru/123?utm_term=kitchen+nightmares+capri+reddit', are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=kitchen+nightmares+capri+reddit In PDF document text
    • https://gemenudotipetal.weebly.com/uploads/1/3/2/6/132695720/bewexatarezuf.pdfIn PDF document text
    • https://vorevowupi.weebly.com/uploads/1/3/4/6/134633589/6898944.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381541/normal_5faba11421459.pdfIn PDF document text
    • https://xavujome.weebly.com/uploads/1/3/0/7/130739328/9324891.pdfIn PDF document text
    • https://latavulepa.weebly.com/uploads/1/3/4/4/134461708/350264.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/medial_cuneiform_stress_fracture.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31796cf3-da35-441b-8fdd-fed20402627f/jazegonebelavipow.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc710ac6879d031da0ff387/t/5fd6ee857fc52c20693958c6/1607921286915/ncert_books_ka_full_form.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1a55868612547ed6365a0/t/5fcd45442bc7884852c23765/1607288133285/cross_stitch_patterns_plastic_canvas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f46cf39e-d45d-40ee-9c3c-4db66dd24505/52790719731.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78519dbf-3030-45bd-8efa-8d93a65ea775/1167654279.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4dfad403f5353fdaf152a/t/5fd08c4da91a8d24337d7a84/1607502925727/31793223670.pdfIn PDF document text
    • https://s3.amazonaws.com/tuletivotarupu/filing_a_police_report_for_stolen_vehicle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72a29cc6-6f4d-4be1-ac12-b0085e21d999/roblox_sheet_music_sad.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2860b2bbd74065810de9f/t/5fcff6b8470abf4ba8f6077c/1607464633663/dapikelo.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_off0000b08c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB08C 5424 bytes
SHA-256: e7f1e816837e398d16465004b98fa54244d3fec47cf7347950e78dd51179979a
font_01_sfnt_off0000c2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2D9 10116 bytes
SHA-256: 5c58e950c27e50ebc5ea4bbc518f5b7253ec77941f860b31526f6199ce61e20e

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