Malicious PDF — malware analysis report

Static analysis result for SHA-256 953e72d0d4d8084d…

MALICIOUS

PDF

76.5 KB Created: 2021-02-18 12:32:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 362960c85725e7be2313b5fa6a7980c5 SHA-1: ae90c8fc2b379ff560c9fe25e6e4e1fb2aac4333 SHA-256: 953e72d0d4d8084d76fd9cc77724f8228ba1b0d67f17b8cec2878e5be3d1e499
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicating a link farm or phishing lure. One URL specifically redirects to known malicious infrastructure, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://yafferge.ru/123?utm_term=how+to+factory+reset+samsung+chromebook+xe303c12 In PDF document text
    • https://purapunebofo.weebly.com/uploads/1/3/4/8/134888030/kuxuzaxibim_zoziwumavutuj_renakuwitoxosa_kupogupaxuxud.pdfIn PDF document text
    • http://cardioactiveitalia.site/java_8_interview_questionsrqjan.pdfIn PDF document text
    • http://aazzzry.space/77627084355qpihx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419827/normal_5fd83de911f80.pdfIn PDF document text
    • http://naturagrush.space/antartida_informacion_en_ingles9jh63.pdfIn PDF document text
    • http://lnstagramverifiedbadgeshelpcenters.net/142596954128xsic.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463010/normal_6024a3510d8d9.pdfIn PDF document text
    • http://sberpodarok2020.online/16955086630pswse.pdfIn PDF document text
    • http://oneitstore.pro/62412814530lhu5y.pdfIn PDF document text
    • http://kreativoblako.com/scansnap_s1500_cleaning_instructionsz4jg3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454303/normal_5fdddfc515da1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481834/normal_5fe13d33929a1.pdfIn PDF document text
    • http://airet.space/569984823311k3uh.pdfIn PDF document text
    • http://teksol.xyz/manufacturing_capacity_planning_templatej7qwf.pdfIn PDF document text
    • http://trikotoria.ru/zetor_5211_service_manualyz141.pdfIn 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_off0000eabb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABB 6180 bytes
SHA-256: 34188070fa6858d32bb1b8f17b34afe795a4a96fd3c84427af9ae4ea429b4d0a
font_01_sfnt_off0000ffc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC2 10940 bytes
SHA-256: 860baa5f6f1c121350c25340349dcdf088a94b56850820deaea40eeeb1b36866

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