Malicious PDF — malware analysis report

Static analysis result for SHA-256 a42b07859f643080…

MALICIOUS

PDF

43.9 KB Created: 2020-10-02 10:43:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: a883b71ba22f11d0d530d5f57ec1356d SHA-1: 3a2cb2ee663c2cac555be84fb7bd8e7151c25c22 SHA-256: a42b07859f64308001039bcbb66bf3b5d0c0f60808e39d8434e60c8cb7bf1fb8
124 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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 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=fundamentals+of+logic+design+7th+edition+solutions In PDF document text
    • http://xiwopaba.ultimateotr.com/uploads/1/3/1/1/131164079/voromidak-vamojesemeneloz-mabinax-pejuvusoronifal.pdfIn PDF document text
    • http://puwala.elranchoteencourtfoundation.com/uploads/1/3/0/7/130776489/cf438dd3126.pdfIn PDF document text
    • http://wapaso.pinerivernewfs.com/uploads/1/3/1/0/131070872/3860566.pdfIn PDF document text
    • http://doxepibir.msmasonsmiddleschool.com/uploads/1/3/0/7/130775850/6418ddd.pdfIn PDF document text
    • https://site-1041173.mozfiles.com/files/1041173/31481290667.pdfIn PDF document text
    • https://site-1037193.mozfiles.com/files/1037193/97540246803.pdfIn PDF document text
    • https://site-1039672.mozfiles.com/files/1039672/56266658170.pdfIn PDF document text
    • https://site-1036969.mozfiles.com/files/1036969/fesuruniwuwunorisixi.pdfIn PDF document text
    • https://site-1037205.mozfiles.com/files/1037205/sebejupu.pdfIn PDF document text
    • https://site-1036884.mozfiles.com/files/1036884/58346482458.pdfIn PDF document text
    • https://site-1036781.mozfiles.com/files/1036781/vuvixasiwebuni.pdfIn PDF document text
    • https://site-1036839.mozfiles.com/files/1036839/78057591592.pdfIn PDF document text
    • https://testbankuniv.eu/Fundamentals-of-Logic-Design-7th-Edition-Roth-Solutions-ManuaIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00005eaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EAF 5376 bytes
SHA-256: 2e8ec0b2c02ea02309d76bc57cba19f8f84b9abf98479df5af802ac1944b5ca9
font_01_sfnt_off000070e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70E1 15180 bytes
SHA-256: 31c523b876a8a5ce0b1150aab1df784f0fe14899c220b0c8e14ee93865b6b2db

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