Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5bb965d480b8ea2…

MALICIOUS

PDF

86.0 KB Created: 2021-03-25 00:44:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: d6dd104f9cbbb3de39a32dc6a28bff00 SHA-1: 5fb8da0ea619d8c60334d746dcd370c9aef7ff53 SHA-256: d5bb965d480b8ea2f3488c32664ec0f2caba2fc1267c99916de2eed042c74992
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with several pointing to disposable hosting and potentially malicious domains, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF is part of a link farm designed to obscure malicious destinations.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://ponafet.ru/award?keyword=concepto+de+anemia+ferropenica+pdf PDF link annotation
    • http://abistrans.ru/diary_of_a_wimpy_kid_15_read_online7yct0.pdfIn PDF document text
    • https://cdn.sqhk.co/bapisolel/hhfoja0/rinewafizibafaliw.pdfIn PDF document text
    • https://cdn.sqhk.co/fusaduxuw/BihjPid/potenijufivumososaxo.pdfIn PDF document text
    • https://cdn.sqhk.co/mofijovelu/SMTidib/vobipufavefabojafowovi.pdfIn PDF document text
    • http://winoraama.fun/81285148530v22ds.pdfIn PDF document text
    • http://biwedujurar.mywebcommunity.org/perimeter_of_rectangles_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/difakezil/gjKfhbe/10967631246.pdfIn PDF document text
    • http://kidufamipowanot.mywebcommunity.org/how_to_enter_bios_setup_in_hp_pavilion_dv6_laptop.pdfIn PDF document text
    • http://scoretdho.best/korarixuwafebakarunom3ge6.pdfIn PDF document text
    • http://gedirobidepud.scienceontheweb.net/rogazixonuvu.pdfIn PDF document text
    • https://cdn.sqhk.co/zelumevimitu/X77BJgm/arena_gorda_beach_punta_cana_dominican_republic.pdfIn PDF document text
    • https://cdn.sqhk.co/dilujuzaga/PEjbjgU/miniso_happy_water_bottle_price.pdfIn PDF document text
    • http://merokomazojewi.scienceontheweb.net/maths_syllabus_stage_1.pdfIn PDF document text
    • https://cdn.sqhk.co/litametun/nvjaAhf/71467611608.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fuguzametekobo.myartsonline.com/ancient_egypt_silverman.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74e15282-d8bb-4cfe-8a9a-aa62d4f7f529/87087536893.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3ac1da2-0ce3-4518-827f-66a65a8db623/xolurejizume.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_off00011167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11167 4996 bytes
SHA-256: 6ccf69c553af8ebe977bdfefad57d3a5e19f44ac00dcbc61d996d7cfb460df69
font_01_sfnt_off00012256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12256 11888 bytes
SHA-256: b430d6748c2d7b15a1feb7f2352eb6598d8b38c82d47b339ae67490c3623aec1

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