Malicious PDF — malware analysis report

Static analysis result for SHA-256 71b7d53c0efa12bc…

MALICIOUS

PDF

77.6 KB Created: 2021-03-22 01:41:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: a094c212044620d522450128c1866c81 SHA-1: 0893cc57eb49a135219c5dc9b5e0eeb292e5e5c7 SHA-256: 71b7d53c0efa12bc0d8131a50138a78c1200dbf00d303506c15b81fe108dceea
192 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'SE_INVOICE_LURE' suggests a phishing pretext. Although no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a phishing attempt to redirect users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://dafemum.ru/strik?utm_term=what+does+burning+a+patch+in+airsoft+mean In PDF document text
    • http://namafafiteg.mypressonline.com/activities_for_toddlers_shapes_and_colors.pdfIn PDF document text
    • http://ejqy.com/midupokoqsoa7.pdfIn PDF document text
    • http://rulabepotinujeb.mypressonline.com/wunud.pdfIn PDF document text
    • http://zabavnyi-slon.ru/how_do_you_program_a_toshiba_tv_without_the_remotefqimy.pdfIn PDF document text
    • http://bexemusu.mypressonline.com/23283694788.pdfIn PDF document text
    • https://cdn.sqhk.co/pawekenu/iaKpd02/98768752816.pdfIn PDF document text
    • http://bezprovodov.guru/derringer_meaning_in_urdu6k7wm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387702/normal_6029f3748f08d.pdfIn PDF document text
    • http://tryraisins.club/afro_asian_literature_download5gn2i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383678/normal_600dd9af544d2.pdfIn PDF document text
    • http://jobediniberine.scienceontheweb.net/best_anatomy_books_for_nurses.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450634/normal_60362d8716014.pdfIn PDF document text
    • http://zifufarox.getenjoyment.net/anexo_1_icao.pdfIn PDF document text
    • http://nubuxeki.scienceontheweb.net/4th_grade_math_worksheets_printable.pdfIn PDF document text
    • https://cdn.sqhk.co/xinulezebi/jaXjbPh/snake_in_toilet_bowl_australia.pdfIn PDF document text
    • https://cdn.sqhk.co/rebibenizuj/dfgewvv/sivijodavesifug.pdfIn PDF document text
    • http://lofitner.buzz/zetuk48qqn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/rupatojuko/action_sheet_swift_3.pdfIn PDF document text
    • http://winimoviwimi.myartsonline.com/quantum_harmonic_oscillator_solution.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/96844984259.pdfIn PDF document text
    • http://sabixukavizom.myartsonline.com/75443084683.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/vobofowaleridaxebavuwo.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/38152240685.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C6 5572 bytes
SHA-256: f05973557c615ec2a84cc34f40d02d892edd25e769101dda39f52a7a73df3931
font_01_sfnt_off0000f397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF397 10896 bytes
SHA-256: c98b78355d2f021155b3be2b5cf217337d5ad48feab87fbd0d1ebe73a632c180
font_02_sfnt_off000118cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CB 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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