Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f50dae6250ae42c…

MALICIOUS

PDF

75.5 KB Created: 2021-03-03 22:14:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 06372f2ae8a8ac5274546a48fa2a764d SHA-1: 0faa91ef0b1d96e94d7b70bd0b9f1d69618867dd SHA-256: 2f50dae6250ae42cb6401d76b933cf34e242031a88424cf6e878406f248d2a0f
184 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirector infrastructure, specifically targeting a search query related to resetting a Samsung Blu-ray player remote. The document's structure and numerous links suggest it functions as a link farm designed to drive traffic to potentially malicious sites. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, and the heuristic firings strongly indicate malicious redirection and phishing intent.

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://crophysi.ru/123?utm_term=how+to+reset+samsung+blu+ray+player+remote In PDF document text
    • https://cdn-cms.f-static.net/uploads/4409393/normal_6020bc51ca54b.pdfIn PDF document text
    • http://pigozolifafaw.iblogger.org/mijexidedeninative.pdfIn PDF document text
    • http://purigoguwoz.22web.org/civilization_revolution_2_mod_apk_android_1.pdfIn PDF document text
    • https://cdn.sqhk.co/revinoxu/eSkBDii/marxist_definition_of_ideology.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426966/normal_5fe09a6761416.pdfIn PDF document text
    • https://cdn.sqhk.co/pogezasamu/j0R4jcA/tumajebirilarozuponak.pdfIn PDF document text
    • https://cdn.sqhk.co/purilusevike/aZgMBha/xabagexabi.pdfIn PDF document text
    • http://peromopativej.mypressonline.com/how_to_turn_a_delta_crib_into_a_toddler_bed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379219/normal_602490eec5778.pdfIn PDF document text
    • http://zememor.sportsontheweb.net/simple_subject_and_simple_predicate_exercises.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://desovizipelo.onlinewebshop.net/dujalurakogoxo.pdfIn PDF document text
    • http://zevusup.atwebpages.com/dujuvubosadatokasag.pdfIn PDF document text
    • http://zozadugaweguj.epizy.com/bursledon_junior_school_uniform.pdfIn PDF document text
    • https://s3.amazonaws.com/wemupajese/neurontin_dosage_forms.pdfIn PDF document text
    • http://papawipowujujed.rf.gd/saretimatiga.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_off0000ea8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8B 5436 bytes
SHA-256: 6b4b1cbbd364491d8b9a216bbb9c284f4b1baee9aed8bcac2895e116e182ad35
font_01_sfnt_off0000fd00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD00 10540 bytes
SHA-256: c3715cdb9bdbfb26f3b6ed4603674cb52bd61d24c91a66b3f5cf18464275802c

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