Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a4fdf8b1a926b12…

MALICIOUS

PDF

80.4 KB Created: 2021-02-19 09:54:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 45996422b784bf6948f645396427f895 SHA-1: b8bc06e567dff018fa4541f4ce48c8bbb8956175 SHA-256: 0a4fdf8b1a926b122241112727798c5faf816877291ffa05b917f2d8bc1fbdea
184 Risk Score

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+use+a+knife+sharpener+coarse+fine In PDF document text
    • http://hookup668.site/mii_music_sheet_musicghlp9.pdfIn PDF document text
    • https://cdn.sqhk.co/nigudovowa/j07Kji8/36625809595.pdfIn PDF document text
    • https://cdn.sqhk.co/mugejufunij/BjbLYhd/my_lips_are_burning_after_eating_spicy_food.pdfIn PDF document text
    • http://fitdieta.com/78084846998arur4.pdfIn PDF document text
    • https://cdn.sqhk.co/zusisoko/fM6zNia/greek_islands_gluten_free_menu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://magakawigola.epizy.com/13508922450.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/facebook_save_video_iphone.pdfIn PDF document text
    • http://mebexadesojixip.rf.gd/baby_girl_names_that_start_with_mi.pdfIn PDF document text
    • http://ramenejepom.rf.gd/signs_and_symptoms_of_diabetic_retinopathy.pdfIn PDF document text
    • http://suwepedufaresi.epizy.com/possessive_pronoun_and_adjective_exercises.pdfIn PDF document text
    • http://mewozegi.epizy.com/kirakaverewiwuma.pdfIn PDF document text
    • http://lisunamubeso.epizy.com/fokujefiwewox.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/5163522758.pdfIn PDF document text
    • http://renepipelusibav.rf.gd/67006527631.pdfIn PDF document text
    • http://puzujudu.rf.gd/melioidosis_guideline_thailand.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_off0000ffef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEF 5188 bytes
SHA-256: 6e0e50cf8f26cbd6761a3b21d62e1675715ac9384f66a2802ac927527a2e9f49
font_01_sfnt_off000111a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A5 10308 bytes
SHA-256: f8323ec79bbfe5bc1b95405e55557a3ffaa525a4dc2d6842ceba8f1e1b597469